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The Philosophy Portal

A portal for Wikipedia's philosophy resources • 17,323 articles in English

The Thinker, a statue by Auguste Rodin, is often used to represent philosophy.

Left to right: Plato, Kant, Nietzsche, Buddha, Confucius, Averroes

Philosophy (from Greek: φιλοσοφία, philosophia, 'love of wisdom') is the systematized study of general and fundamental questions, such as those concerning existence, reason, knowledge, values, mind, and language. Some sources claim the term was coined by Pythagoras (c. 570 – c. 495 BCE), although this theory is disputed by some. Philosophical methods include questioning, critical discussion, rational argument, and systematic presentation.

Historically, philosophy encompassed all bodies of knowledge and a practitioner was known as a philosopher. "Natural philosophy", which began as a discipline in ancient India and Ancient Greece, encompasses astronomy, medicine, and physics. For example, Isaac Newton's 1687 Mathematical Principles of Natural Philosophy later became classified as a book of physics. In the 19th century, the growth of modern research universities led academic philosophy and other disciplines to professionalize and specialize. Since then, various areas of investigation that were traditionally part of philosophy have become separate academic disciplines, and namely the social sciences such as psychology, sociology, linguistics, and economics.

Today, major subfields of academic philosophy include metaphysics, which is concerned with the fundamental nature of existence and reality; epistemology, which studies the nature of knowledge and belief; ethics, which is concerned with moral value; and logic, which studies the rules of inference that allow one to derive conclusions from true premises. Other notable subfields include philosophy of religion, philosophy of science, political philosophy, aesthetics, philosophy of language, and philosophy of mind. (Full article...)

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Featured articles are displayed here, which represent some of the best content on English Wikipedia.

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Lenin in 1920

Vladimir Ilyich Ulyanov (22 April [O.S. 10 April] 1870 – 21 January 1924), better known as Vladimir Lenin, was a Russian lawyer, revolutionary, politician, and political theorist. He served as the first and founding head of government of Soviet Russia from 1917 to 1924 and of the Soviet Union from 1922 to 1924. Under his administration, Russia, and later the Soviet Union, became a one-party socialist state governed by the Communist Party. Ideologically a Marxist, his development of the ideology is known as Leninism.

Born to an upper-middle-class family in Simbirsk, Lenin embraced revolutionary socialist politics following his brother's 1887 execution. Expelled from Kazan Imperial University for participating in protests against the Russian Empire's Tsarist government, he devoted the following years to a law degree. He moved to Saint Petersburg in 1893 and became a senior Marxist activist. In 1897, he was arrested for sedition and exiled to Shushenskoye in Siberia for three years, where he married Nadezhda Krupskaya. After his exile, he moved to Western Europe, where he became a prominent theorist in the Marxist Russian Social Democratic Labour Party (RSDLP). In 1903, he took a key role in the RSDLP ideological split, leading the Bolshevik faction against Julius Martov's Mensheviks. Following Russia's failed Revolution of 1905, he campaigned for the First World War to be transformed into a Europe-wide proletarian revolution, which, as a Marxist, he believed would cause the overthrow of capitalism and its replacement with socialism. After the 1917 February Revolution ousted the Tsar and established a Provisional Government, he returned to Russia to play a leading role in the October Revolution in which the Bolsheviks overthrew the new regime. (Full article...)
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Portrait, 1910

Billings Learned Hand (/ˈlɜːrnɪd/ LURN-id; January 27, 1872 – August 18, 1961) was an American jurist, lawyer, and judicial philosopher. He served as a federal trial judge on the U.S. District Court for the Southern District of New York from 1909 to 1924 and as a federal appellate judge on the U.S. Court of Appeals for the Second Circuit from 1924 to 1951.

Born and raised in Albany, New York, Hand majored in philosophy at Harvard College and graduated with honors from Harvard Law School. After a relatively undistinguished career as a lawyer in Albany and New York City, he was appointed at the age of 37 as a Manhattan federal district judge in 1909. The profession suited his detached and open-minded temperament, and his decisions soon won him a reputation for craftsmanship and authority. Between 1909 and 1914, under the influence of Herbert Croly's social theories, Hand supported New Nationalism. He ran unsuccessfully as the Progressive Party's candidate for chief judge of the New York Court of Appeals in 1913, but withdrew from active politics shortly afterwards. In 1924, President Calvin Coolidge elevated Hand to the Court of Appeals for the Second Circuit, which he went on to lead as the senior circuit judge (later retitled chief judge) from 1939 until his semi-retirement in 1951. Scholars have recognized the Second Circuit under Hand as one of the finest appeals courts in American history. Friends and admirers often lobbied for Hand's promotion to the Supreme Court, but circumstances and his political past conspired against his appointment. (Full article...)
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The title-page of the 1759 edition published by Cramer in Geneva, which reads, "Candide, or Optimism, translated from the German of Dr. Ralph."

Candide, ou l'Optimisme (/kɒnˈdiːd/ kon-DEED, French: [kɑ̃did] (listen)) is a French satire written by Voltaire, a philosopher of the Age of Enlightenment, first published in 1759. The novella has been widely translated, with English versions titled Candide: or, All for the Best (1759); Candide: or, The Optimist (1762); and Candide: Optimism (1947). It begins with a young man, Candide, who is living a sheltered life in an Edenic paradise and being indoctrinated with Leibnizian optimism by his mentor, Professor Pangloss. The work describes the abrupt cessation of this lifestyle, followed by Candide's slow and painful disillusionment as he witnesses and experiences great hardships in the world. Voltaire concludes Candide with, if not rejecting Leibnizian optimism outright, advocating a deeply practical precept, "we must cultivate our garden", in lieu of the Leibnizian mantra of Pangloss, "all is for the best" in the "best of all possible worlds".

Candide is characterized by its tone as well as by its erratic, fantastical, and fast-moving plot. A picaresque novel with a story similar to that of a more serious coming-of-age narrative (Bildungsroman), it parodies many adventure and romance clichés, the struggles of which are caricatured in a tone that is bitter and matter-of-fact. Still, the events discussed are often based on historical happenings, such as the Seven Years' War and the 1755 Lisbon earthquake. As philosophers of Voltaire's day contended with the problem of evil, so does Candide in this short theological novel, albeit more directly and humorously. Voltaire ridicules religion, theologians, governments, armies, philosophies, and philosophers. Through Candide, he assaults Leibniz and his optimism. (Full article...)
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Icon of St. Maximus

Maximus the Confessor (Greek: Μάξιμος ὁ Ὁμολογητής), also spelt Maximos, otherwise known as Maximus the Theologian and Maximus of Constantinople (c. 580 – 13 August 662), was a Christian monk, theologian, and scholar.

In his early life, Maximus was a civil servant, and an aide to the Byzantine Emperor Heraclius. He gave up this life in the political sphere to enter the monastic life. Maximus had studied diverse schools of philosophy, and certainly what was common for his time, the Platonic dialogues, the works of Aristotle, and numerous later Platonic commentators on Aristotle and Plato, like Plotinus, Porphyry, Iamblichus, and Proclus. When one of his friends began espousing the Christological position known as Monothelitism, Maximus was drawn into the controversy, in which he supported an interpretation of the Chalcedonian formula on the basis of which it was asserted that Jesus had both a human and a divine will. Maximus is venerated in both the Catholic and Eastern Orthodox Churches. He was eventually persecuted for his Christological positions; following a trial, his tongue and right hand were mutilated. (Full article...)
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Anekāntavāda (Hindi: अनेकान्तवाद, "many-sidedness") is the Jain doctrine about metaphysical truths that emerged in ancient India. It states that the ultimate truth and reality is complex and has multiple aspects.

According to Jainism, no single, specific statement can describe the nature of existence and the absolute truth. This knowledge (Kevala Jnana), it adds, is comprehended only by the Arihants. Other beings and their statements about absolute truth are incomplete, and at best a partial truth. All knowledge claims, according to the anekāntavāda doctrine must be qualified in many ways, including being affirmed and denied. Anekāntavāda is a fundamental doctrine of Jainism. (Full article...)
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Portrait by Joshua Reynolds, c. 1772

Samuel Johnson (18 September 1709 [OS 7 September] – 13 December 1784), often called Dr Johnson, was an English writer who made lasting contributions as a poet, playwright, essayist, moralist, critic, biographer, editor, and lexicographer. The Oxford Dictionary of National Biography calls him "arguably the most distinguished man of letters in English history".

Born in Lichfield, Staffordshire, he attended Pembroke College, Oxford, until lack of funds forced him to leave. After working as a teacher, he moved to London and began writing for The Gentleman's Magazine. Early works include Life of Mr Richard Savage, the poems London and The Vanity of Human Wishes and the play Irene. After nine years' effort, Johnson's A Dictionary of the English Language appeared in 1755, and was acclaimed as "one of the greatest single achievements of scholarship". Later work included essays, an annotated The Plays of William Shakespeare, and the apologue The History of Rasselas, Prince of Abissinia. In 1763 he befriended James Boswell, with whom he travelled to Scotland, as Johnson described in A Journey to the Western Islands of Scotland. Near the end of his life came a massive, influential Lives of the Most Eminent English Poets of the 17th and 18th centuries. (Full article...)
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Mary Wollstonecraft by John Opie, c. 1797

Mary Wollstonecraft (/ˈwʊlstənkræft/, also UK: /-krɑːft/; 27 April 1759 – 10 September 1797) was a British writer, philosopher, and advocate of women's rights. Until the late 20th century, Wollstonecraft's life, which encompassed several unconventional personal relationships at the time, received more attention than her writing. Today Wollstonecraft is regarded as one of the founding feminist philosophers, and feminists often cite both her life and her works as important influences.

During her brief career she wrote novels, treatises, a travel narrative, a history of the French Revolution, a conduct book, and a children's book. Wollstonecraft is best known for A Vindication of the Rights of Woman (1792), in which she argues that women are not naturally inferior to men but appear to be only because they lack education. She suggests that both men and women should be treated as rational beings and imagines a social order founded on reason. (Full article...)
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Bohr in 1922

Niels Henrik David Bohr (Danish: [ˈne̝ls ˈpoɐ̯ˀ]; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.

Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid. He conceived the principle of complementarity: that items could be separately analysed in terms of contradictory properties, like behaving as a wave or a stream of particles. The notion of complementarity dominated Bohr's thinking in both science and philosophy. (Full article...)
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Carte de visite by James E. Purdy, 1907

William Edward Burghardt Du Bois (/djuːˈbɔɪs/ dew-BOYSS; February 23, 1868 – August 27, 1963) was an American sociologist, socialist, historian, and Pan-Africanist civil rights activist. Born in Great Barrington, Massachusetts, Du Bois grew up in a relatively tolerant and integrated community. After completing graduate work at the Friedrich Wilhelm University (in Berlin, Germany) and Harvard University, where he was the first African American to earn a doctorate, he became a professor of history, sociology, and economics at Atlanta University. Du Bois was one of the founders of the National Association for the Advancement of Colored People (NAACP) in 1909.

Du Bois rose to national prominence as a leader of the Niagara Movement, a group of African-American activists who wanted equal rights for blacks. Du Bois and his supporters opposed the Atlanta compromise, an agreement crafted by Booker T. Washington which provided that Southern blacks would work and submit to white political rule, while Southern whites guaranteed that blacks would receive basic educational and economic opportunities. Instead, Du Bois insisted on full civil rights and increased political representation, which he believed would be brought about by the African-American intellectual elite. He referred to this group as the Talented Tenth, a concept under the umbrella of racial uplift, and believed that African Americans needed the chances for advanced education to develop its leadership. (Full article...)
Title page from the first edition of Locke's Some Thoughts Concerning Education (1693)
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Portrait of Rădulescu

Ion Heliade Rădulescu or Ion Heliade (also known as Eliade or Eliade Rădulescu; Romanian pronunciation: [ˈi.on heliˈade rəduˈlesku]; January 6, 1802 – April 27, 1872) was a Wallachian, later Romanian academic, Romantic and Classicist poet, essayist, memoirist, short story writer, newspaper editor and politician. A prolific translator of foreign literature into Romanian, he was also the author of books on linguistics and history. For much of his life, Heliade Rădulescu was a teacher at Saint Sava College in Bucharest, which he helped reopen. He was a founding member and first president of the Romanian Academy.

Heliade Rădulescu is considered one of the foremost champions of Romanian culture from the first half of the 19th century, having first risen to prominence through his association with Gheorghe Lazăr and his support of Lazăr's drive for discontinuing education in Greek. Over the following decades, he had a major role in shaping the modern Romanian language, but caused controversy when he advocated the massive introduction of Italian neologisms into the Romanian lexis. A Romantic nationalist landowner siding with moderate liberals, Heliade was among the leaders of the 1848 Wallachian revolution, after which he was forced to spend several years in exile. Adopting an original form of conservatism, which emphasized the role of the aristocratic boyars in Romanian history, he was rewarded for supporting the Ottoman Empire and clashed with the radical wing of the 1848 revolutionaries. (Full article...)
$Image 12Portrait of Kepler by an unknown artist in 1620Johannes Kepler (/ˈkɛplər/; German: [joˈhanəs ˈkɛplɐ, -nɛs -] (listen); 27 December 1571 – 15 November 1630) was a German astronomer, mathematician, astrologer, natural philosopher and writer on music. He is a key figure in the 17th-century Scientific Revolution, best known for his laws of planetary motion, and his books Astronomia nova, Harmonice Mundi, and Epitome Astronomiae Copernicanae. These works also provided one of the foundations for Newton's theory of universal gravitation.Kepler was a mathematics teacher at a seminary school in Graz, where he became an associate of Prince Hans Ulrich von Eggenberg. Later he became an assistant to the astronomer Tycho Brahe in Prague, and eventually the imperial mathematician to Emperor Rudolf II and his two successors Matthias and Ferdinand II. He also taught mathematics in Linz, and was an adviser to General Wallenstein.Additionally, he did fundamental work in the field of optics, invented an improved version of the refracting (or Keplerian) telescope, and was mentioned in the telescopic discoveries of his contemporary Galileo Galilei. (Full article...)$

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Portrait of Kepler by an unknown artist in 1620

Johannes Kepler (/ˈkɛplər/; German: [joˈhanəs ˈkɛplɐ, -nɛs -] (listen); 27 December 1571 – 15 November 1630) was a German astronomer, mathematician, astrologer, natural philosopher and writer on music. He is a key figure in the 17th-century Scientific Revolution, best known for his laws of planetary motion, and his books Astronomia nova, Harmonice Mundi, and Epitome Astronomiae Copernicanae. These works also provided one of the foundations for Newton's theory of universal gravitation.

Kepler was a mathematics teacher at a seminary school in Graz, where he became an associate of Prince Hans Ulrich von Eggenberg. Later he became an assistant to the astronomer Tycho Brahe in Prague, and eventually the imperial mathematician to Emperor Rudolf II and his two successors Matthias and Ferdinand II. He also taught mathematics in Linz, and was an adviser to General Wallenstein.
Additionally, he did fundamental work in the field of optics, invented an improved version of the refracting (or Keplerian) telescope, and was mentioned in the telescopic discoveries of his contemporary Galileo Galilei. (Full article...)
Mary Wollstonecraft by John Opie (c. 1791)
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Intelligent design (ID) is a pseudoscientific argument for the existence of God, presented by its proponents as "an evidence-based scientific theory about life's origins". Proponents claim that "certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection." ID is a form of creationism that lacks empirical support and offers no testable or tenable hypotheses, and is therefore not science. The leading proponents of ID are associated with the Discovery Institute, a Christian, politically conservative think tank based in the United States.

Although the phrase intelligent design had featured previously in theological discussions of the argument from design, its first publication in its present use as an alternative term for creationism was in Of Pandas and People, a 1989 creationist textbook intended for high school biology classes. The term was substituted into drafts of the book, directly replacing references to creation science and creationism, after the 1987 Supreme Court's Edwards v. Aguillard decision barred the teaching of creation science in public schools on constitutional grounds. From the mid-1990s, the intelligent design movement (IDM), supported by the Discovery Institute, advocated inclusion of intelligent design in public school biology curricula. This led to the 2005 Kitzmiller v. Dover Area School District trial, which found that intelligent design was not science, that it "cannot uncouple itself from its creationist, and thus religious, antecedents", and that the public school district's promotion of it therefore violated the Establishment Clause of the First Amendment to the United States Constitution. (Full article...)
Priestley, painted late in life by Rembrandt Peale (c. 1800)

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... that the philosopher Emil Utitz, a classmate of Franz Kafka, became the head librarian of Theresienstadt Ghetto?
... that Mary Clarke raised eight children and managed an estate whilst corresponding by letter with philosopher John Locke?
... that in his book Thematic Origins of Scientific Thought: Kepler to Einstein, Gerald Holton argues that philosophy from Either/Or influenced Niels Bohr's concept of complementarity?
... that Henry E. Sigerist felt "depressed" after reading A History of Science, Technology, and Philosophy in the 16th and 17th Centuries?
... that Yugoslav politician Miloš Trifunović was briefly professor of zoology and botany despite graduating from the Faculty of Philosophy of the Belgrade Higher School?
... that Lee M. Hollander pioneered the translation of the works of the Danish philosopher Søren Kierkegaard into English?
... that philosopher George Pitcher adopted a stray dog and her puppy that he took everywhere, including on a trip to France aboard the Queen Elizabeth 2?
... that political philosophy professor Werner J. Dannhauser was the basis for a character in a Saul Bellow novel?

Selected philosopher of the week

Jacques-Marie-Émile Lacan (April 13, 1901 – September 9, 1981) was a French psychoanalyst and psychiatrist. His work, like most psychoanalytic work, owes a heavy, explicit debt to Sigmund Freud, but also drew from a number of other fields, including linguistics, philosophy, and mathematics. This interdisciplinary focus in his work has led him to be an important figure in many fields beyond psychoanalysis - particularly within critical theory.

His central idea was that the human subject is a creation of its use of language. From this understanding Lacan develops his study of psychoanalysis and his treatment strategies. His work, while controversial, continues to influence the development of psychoanalysis worldwide. In France and elsewhere various "schools" of Lacanian thought have emerged.

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Selected article of the week

Non-cognitivism is the meta-ethical view that moral statements lack truth-value and do not assert propositions. A noncognitivist denies the cognitivist claim that "moral judgments are capable of being objectively true, because they describe some feature of the world." If moral statements cannot be true, and if one cannot know something that is not true, noncognitivism implies that moral knowledge is impossible.

While the bare term non-cognitivism usually refers to ethics, it can also be applied in other branches of philosophy, as in theological noncognitivism.

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These are Good articles, which meet a core set of high editorial standards.

Eliminativists argue that modern belief in the existence of mental phenomena is analogous to the ancient belief in obsolete theories such as the geocentric model of the universe
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This portrait attributed to Francesco Melzi, c. 1515–1518, is the only certain contemporary depiction of Leonardo.

Leonardo di ser Piero da Vinci (15 April 1452 – 2 May 1519) was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect. While his fame initially rested on his achievements as a painter, he also became known for his notebooks, in which he made drawings and notes on a variety of subjects, including anatomy, astronomy, botany, cartography, painting, and paleontology. Leonardo is widely regarded to have been a genius who epitomized the Renaissance humanist ideal, and his collective works comprise a contribution to later generations of artists matched only by that of his younger contemporary, Michelangelo.

Born out of wedlock to a successful notary and a lower-class woman in, or near, Vinci, he was educated in Florence by the Italian painter and sculptor Andrea del Verrocchio. He began his career in the city, but then spent much time in the service of Ludovico Sforza in Milan. Later, he worked in Florence and Milan again, as well as briefly in Rome, all while attracting a large following of imitators and students. Upon the invitation of Francis I, he spent his last three years in France, where he died in 1519. Since his death, there has not been a time where his achievements, diverse interests, personal life, and empirical thinking have failed to incite interest and admiration, making him a frequent namesake and subject in culture. (Full article...)
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1799 portrait of Novalis

Georg Philipp Friedrich Freiherr von Hardenberg (2 May 1772 – 25 March 1801), pen name Novalis (German pronunciation: [noˈvaːlɪs]), was a German aristocrat and polymath, who was a poet, novelist, philosopher and mystic. He is regarded as an idiosyncratic and influential figure of Jena Romanticism.

Novalis was born into a minor aristocratic family in Electoral Saxony. He was the second of eleven children; his early household observed a strict Pietist faith. He studied law at the University of Jena, the University of Leipzig, and the University of Wittenberg. While at Jena, he published his first poem and befriended the playwright and fellow poet Friedrich Schiller. In Leipzig, he then met Friedrich Schlegel, becoming lifetime friends. Novalis completed his law degree in 1794 at the age of 22. He then worked as a legal assistant in Tennstedt immediately after graduating. There, he met Sophie von Kühn. The following year Novalis and Sophie became secretly engaged. Sophie became severely ill soon after the engagement and died just after her 15th birthday. Sophie's early death had a life-long impact on Novalis and his writing. (Full article...)
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Clare Palmer (born 1967) is a British philosopher, theologian and scholar of environmental and religious studies who is currently a professor in the Department of Philosophy at Texas A&M University. She has previously held academic appointments at the University of Greenwich, the University of Stirling, Lancaster University and Washington University in St. Louis, among others. Palmer is known for her work in environmental and animal ethics.

She has published three sole-authored books—Environmental Ethics (ABC-CLIO, 1997), Environmental Ethics and Process Thinking (Oxford University Press, 1998) and Animal Ethics in Context (Columbia University Press, 2010)—as well as the co-authored Companion Animal Ethics (Wiley-Blackwell, 2015) and seven sole- or co-edited collections and anthologies. She is a former editor of the religious studies journal Worldviews: Environment, Culture, Religion, and a former president of the International Society for Environmental Ethics. (Full article...)
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Bust of Pythagoras of Samos in the
Capitoline Museums, Rome

Pythagoras of Samos (Ancient Greek: Πυθαγόρας ὁ Σάμιος, romanized: Pythagóras ho Sámios, lit. 'Pythagoras the Samian', or simply Πυθαγόρας; Πυθαγόρης in Ionian Greek; c. 570 – c. 495 BC) was an ancient Ionian Greek philosopher and the eponymous founder of Pythagoreanism. His political and religious teachings were well known in Magna Graecia and influenced the philosophies of Plato, Aristotle, and, through them, the West in general. Knowledge of his life is clouded by legend, but he appears to have been the son of Mnesarchus, a gem-engraver on the island of Samos. Modern scholars disagree regarding Pythagoras's education and influences, but they do agree that, around 530 BC, he travelled to Croton in southern Italy, where he founded a school in which initiates were sworn to secrecy and lived a communal, ascetic lifestyle. This lifestyle entailed a number of dietary prohibitions, traditionally said to have included vegetarianism, although modern scholars doubt that he ever advocated complete vegetarianism.

The teaching most securely identified with Pythagoras is metempsychosis, or the "transmigration of souls", which holds that every soul is immortal and, upon death, enters into a new body. He may have also devised the doctrine of musica universalis, which holds that the planets move according to mathematical equations and thus resonate to produce an inaudible symphony of music. Scholars debate whether Pythagoras developed the numerological and musical teachings attributed to him, or if those teachings were developed by his later followers, particularly Philolaus of Croton. Following Croton's decisive victory over Sybaris in around 510 BC, Pythagoras's followers came into conflict with supporters of democracy, and Pythagorean meeting houses were burned. Pythagoras may have been killed during this persecution, or he may have escaped to Metapontum and died there. (Full article...)
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Buddhaghosa with three copies of Visuddhimagga, Kelaniya Raja Maha Vihara

Buddhaghosa was a 5th-century Indian Theravada Buddhist commentator, translator and philosopher. He worked in the Great Monastery (Mahāvihāra) at Anurādhapura, Sri Lanka and saw himself as being part of the Vibhajjavāda school and in the lineage of the Sinhalese Mahāvihāra.

His best-known work is the Visuddhimagga ("Path of Purification"), a comprehensive summary of older Sinhala commentaries on Theravada teachings and practices. According to Sarah Shaw, in Theravada this systematic work is "the principal text on the subject of meditation." The interpretations provided by Buddhaghosa have generally constituted the orthodox understanding of Theravada scriptures since at least the 12th century CE. (Full article...)
Saint Irenaeus, the second-century philosopher and theologian who inspired the development of the Irenaean theodicy.
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The denomination effect is a form of cognitive bias relating to currency, suggesting people may be less likely to spend larger currency denominations than their equivalent value in smaller denominations. It was proposed by Priya Raghubir, professor at the New York University Stern School of Business, and Joydeep Srivastava, professor at University of Maryland, in their 2009 paper "Denomination Effect".

Raghubir and Srivastava conducted three studies in their research on the denomination effect; their findings suggested people may be more likely to spend money represented by smaller denominations and that consumers may prefer to receive money in a large denomination when there is a need to control spending. The denomination effect can occur when large denominations are perceived as less exchangeable than smaller denominations. (Full article...)
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Weber in 1918

Maximilian Karl Emil Weber (/ˈveɪbər/; German: [ˈveːbɐ]; 21 April 1864 – 14 June 1920) was a German sociologist, historian, jurist and political economist, who is regarded as among the most important theorists of the development of modern Western society. His ideas profoundly influence social theory and research. While Weber did not see himself as a sociologist, he is recognized as one of the fathers of sociology, along with Karl Marx and Émile Durkheim.

Unlike Durkheim, Weber did not believe in monocausal explanations, proposing instead that for any outcome there can be multiple causes. Also unlike Durkheim, Weber was a key proponent of methodological anti-positivism, arguing for the study of social action through interpretive rather than purely empiricist methods, based on a subjective understanding of the meanings that individuals attach to their own actions. Weber's main intellectual concern was in understanding the processes of rationalisation, secularisation, and the ensuing sense of "disenchantment". He formulated a thesis arguing that such processes are associated with the rise of capitalism and modernity. (Full article...)
A 16th-century miniature showing a meeting of doctors at the University of Paris.
Broad classification of Karmas as per Jain philosophy
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Title page of first edition; 1889

Siddhantasara (pronounced [sɪd'ðantsar]; transl. The Gist of Principles) is a 1889 Gujarati book on the history of philosophy by Indian writer and philosopher Manilal Dwivedi. It is a historical critique of the world's religious philosophies. The book deals with the evolution of religious sentiment and attempts to establish the superiority of the Advaita philosophy over other religious philosophies.

Siddhantasara received positive reviews and became a landmark in the history of Gujarati literature but was also criticised because of the logical lapses and inconsistencies in the author's arguments. Manishankar Bhatt (known as Kavi Kant) published his review as a book titled Siddhantasaranu Avalokan (Analysis of Siddhantasara). Siddhantasara is considered by critics to be Manilal's most important work, and has been seen as a response to the cultural agenda and reform activities of colonial India at the time. (Full article...)
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John Hadley (born 27 September 1966) is an Australian philosopher whose research concerns moral and political philosophy, including animal ethics, environmental ethics, and metaethics. He is currently a senior lecturer in philosophy in the School of Humanities and Communication Arts at Western Sydney University. He has previously taught at Charles Sturt University and the University of Sydney, where he studied as an undergraduate and doctoral candidate. In addition to a variety of articles in peer-reviewed journals and edited collections, he is the author of the 2015 monograph Animal Property Rights (Lexington Books) and the 2019 monograph Animal Neopragmatism (Palgrave Macmillan). He is also the co-editor, with Elisa Aaltola, of the 2015 collection Animal Ethics and Philosophy (Rowman & Littlefield International).

Hadley is known for his account of animal property rights theory. He proposes that wild animals be offered property rights over their territories, and that guardians be appointed to represent their interests in decision-making procedures. He suggests that this account could be justified directly, on the basis of the interests of the animals concerned, or indirectly, so that natural environments are protected. The theory has received discussion in popular and academic contexts, with critical responses from farming groups and mixed responses from moral and political theorists. (Full article...)
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Animal Rights Without Liberation: Applied Ethics and Human Obligations is a 2012 book by the British political theorist Alasdair Cochrane, in which it is argued that animal rights philosophy can be decoupled from animal liberation philosophy by the adoption of the interest-based rights approach. Cochrane, arguing that there is no reason that (nonhuman) animals should be excluded from justice, adopts Joseph Raz's account of interest rights and extends it to include animals. He argues that sentient animals possess a right not to be made to suffer and a right not to be killed, but not a right to freedom. The book's chapters apply Cochrane's account to a number of interactions between humans and animals; first animal experimentation, then animal agriculture, the genetic engineering of animals, the use of animals in entertainment and sport, the relationship of animals to environmental practices and the use of animals in cultural practices.

The book is based upon Cochrane's doctoral thesis, which was completed at the London School of Economics, and builds upon subjects he had discussed in previous publications, including his first book. An Introduction to Animals and Political Theory. It was published by Columbia University Press as the second book in their series Critical Perspectives on Animals, edited by Gary Francione and Gary Steiner. Critics from a variety of backgrounds responded positively to the book, focussing on how Cochrane had found a middle ground between traditional animal rights philosophy and utilitarianism. (Full article...)

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The following are images from various philosophy-related articles on Wikipedia.

Image 1Portrait of Immanuel Kant, c. 1790 (from Western philosophy)
Image 2Bust of Socrates, Roman copy after a Greek original from the 4th century BCE (from Western philosophy)
Image 3Fukuzawa Yukichi (1862) a key civil rights activist and liberal thinker (from Eastern philosophy)
Image 4Valluvar, the Tamil philosopher of the post-Sangam era (from Eastern philosophy)
Image 5St. Anselm of Canterbury is credited as the founder of scholasticism. (from Western philosophy)
Image 6Sigmund Freud by Max Halberstadt, c. 1921 (from Western philosophy)
Image 7The Buddhist Nalanda university and monastery was a major center of learning in India from the 5th century CE to c. 1200. (from Eastern philosophy)
Image 8Martin Heidegger (from Western philosophy)
Image 9St. Thomas Aquinas, painting by Carlo Crivelli, 1476 (from Western philosophy)
Image 10Gottlob Frege, c. 1905 (from Western philosophy)
Image 11Abbo of Fleury (from Medieval philosophy)
Image 12Portrait of John Locke, by Sir Godfrey Kneller, 1697 (from Western philosophy)
Image 13Bronze statue of Giordano Bruno by Ettore Ferrari, Campo de' Fiori, Rome (from Western philosophy)
Image 14Xiong Shili circa 1960 (from Eastern philosophy)
Image 15From left to right: Virchand Gandhi, Anagarika Dharmapala, Swami Vivekananda, G. Bonet Maury. Parliament of World Religions, 1893 (from Eastern philosophy)
Image 16Avicenna (from Medieval philosophy)
Image 17Portrait by Philippe de Champaigne, 17th century (from Medieval philosophy)
Image 18Confucius (from Eastern philosophy)
Image 19Edmund Husserl, in the 1910s (from Western philosophy)
Image 20William James in 1906 (from Western philosophy)
Image 21Adi Shankara (8th century CE) the main exponent of Advaita Vedānta (from Eastern philosophy)
Image 22Georg Wilhelm Friedrich Hegel, steel engraving, after 1828 (from Western philosophy)
Image 23Ionia, source of early Greek philosophy, in western Asia Minor (from Western philosophy)
Image 24Ferdinand de Saussure (from Western philosophy)
Image 25Saint Augustine. (from Western philosophy)
Image 26Patricia Churchland, 2005 (from Western philosophy)
Image 27Hu Shih and DT Suzuki during his visit to China in 1934 (from Eastern philosophy)
Image 28Aristotle in The School of Athens, by Raphael (from Western philosophy)
Image 29Bertrand Russell (from Western philosophy)
Image 30Søren Kierkegaard, sketch by Niels Christian Kierkegaard, c. 1840 (from Western philosophy)
Image 31Map of Alexander the Great's empire and the route he and Pyrrho of Elis took to India (from Western philosophy)
Image 32Friedrich Nietzsche, photograph by Friedrich Hartmann, c. 1875 (from Western philosophy)
Image 33Erasmus is Credited as the Prince of the Humanists (from Western philosophy)
Image 34Portrait of René Descartes, after Frans Hals, second half of 17th century (from Western philosophy)
Image 35The philosopher Pyrrho of Elis, in an anecdote taken from Sextus Empiricus' Outlines of Pyrrhonism
(upper)PIRRHO • HELIENSIS •
PLISTARCHI • FILIVS
translation (from Latin): Pyrrho • Greek • Son of Plistarchus

(middle)OPORTERE • SAPIENTEM
HANC ILLIVS IMITARI
SECVRITATEMtranslation (from Latin): It is right wisdom then that all imitate this security (Pyrrho pointing at a peaceful pig munching his food)

(lower)Whoever wants to apply the real wisdom, shall not mind trepidation and misery
(from Ancient Greek philosophy)
Image 36Pyrrho of Elis, marble head, Roman copy, Archaeological Museum of Corfu (from Western philosophy)
Image 37The Seven Sages of the Bamboo Grove, embroidery, 1860–1880 (from Eastern philosophy)
Image 38Portrait of David Hume, by Allan Ramsay, 1754 (from Western philosophy)
Image 39Four Greek philosophers: Socrates, Antisthenes, Chrysippos, Epicurus; British Museum (from Ancient Greek philosophy)

Selected pictures

Image 1The House Builders (Portraits of Sir W.E. & The Hon. Lady Welby-Gregory), an 1880 painting by Frank Dicksee
Image 2Carl von Linné, Alexander Roslin, 1775 (oil on canvas, Gripsholm Castle). Linnaeus was a Swedish botanist, zoologist, and physician who formalised binomial nomenclature, the modern system of naming organisms. He is known as the "father of modern taxonomy".
Image 3The statue of Immanuel Kant in front of the Immanuel Kant State University of Russia in Kaliningrad. The statue was made by notable sculptor Christian Daniel Rauch and unveiled in 1864. The statue was destroyed in 1945, but was remoulded in 1992 on the initiative of Marion Dönhoff.
Image 4Oscar Wilde reclining with Poems, by Napoleon Sarony, in New York in 1882. Wilde often liked to appear idle, though in fact he worked hard; by the late 1880s he was a father, an editor, and a writer.
Image 5Adam Smith (baptised 16 June 1723 – died 17 July 1790 [OS: 5 June 1723 – 17 July 1790]) was a Scottish moral philosopher and a pioneer of political economics. One of the key figures of the Scottish Enlightenment, Smith is the author of The Theory of Moral Sentiments and An Inquiry into the Nature and Causes of the Wealth of Nations. The latter, usually abbreviated as The Wealth of Nations, is considered his magnum opus and the first modern work of economics. Smith is widely cited as the father of modern economics.
Image 6Jane Addams (1860–1935) was an American settlement activist, reformer, social worker, sociologist, public administrator and author. She was a notable figure in the history of social work and women's suffrage in the United States and an advocate for world peace.
Image 7Painting of Gottfried Wilhelm Leibniz by Christoph Bernhard Francke, Braunschweig, Herzog Anton Ulrich Museum, 1700.
Image 8Niels Bohr (1885–1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.
Image 9Voltairine de Cleyre (1866–1912) was an American anarchist known for being a prolific writer and speaker who opposed state power, the capitalism she saw as interconnected with it, and marriage, and the domination of religion over sexuality and women's lives. She is often characterized as a major early feminist because of her views.
Image 10The center third of Education (1890), a stained glass window by Louis Comfort Tiffany and Tiffany Studios, located in Linsly-Chittenden Hall at Yale University. It depicts Science (personified by Devotion, Labor, Truth, Research and Intuition) and Religion (personified by Purity, Faith, Hope, Reverence and Inspiration) in harmony, presided over by the central personification of "Light·Love·Life".
Image 11Philosophy, an 1896 mural by Robert Lewis Reid in the North Corridor on the Second Floor of the Library of Congress Thomas Jefferson Building, Washington, D.C.. The caption underneath reads: "HOW CHARMING IS DIVINE PHILOSOPHY."
Image 12Umberto Eco OMRI (1932–2016) was an Italian novelist, literary critic, philosopher, semiotician, and university professor. He is widely known for his 1980 novel Il nome della rosa (The Name of the Rose), a historical mystery combining semiotics in fiction with biblical analysis, medieval studies, and literary theory.
Image 13Leo Tolstoy in 1897. Count Lev Nikolayevich Tolstoy was a Russian writer who is regarded as one of the greatest authors of all time.
Image 14Friedrich Schiller (1759–1805) was a German poet, philosopher, physician, historian and playwright.
Image 15Lady Dorothy Browne and Sir Thomas Browne is an oil on panel painting attributed to the English artist Joan Carlile, and probably completed between 1641 and 1650. The painting depicts English physician Thomas Browne and his wife Dorothy.
Image 16Plato (left) and Aristotle (right), a detail of The School of Athens, a fresco by Raphael. Aristotle gestures to the earth, representing his belief in knowledge through empirical observation and experience, while holding a copy of his Nicomachean Ethics in his hand, whilst Plato gestures to the heavens, representing his belief in The Forms.
Image 17A statue of peripatetic philosopher and botanist Theophrastus at the Palermo Botanical Gardens.

Topics

Philosophy

Branches

Traditional

Philosophy of...

Art
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Schools of thought

By era

Ancient

Chinese	Agriculturalism Confucianism Legalism Logicians Mohism Chinese naturalism Neotaoism Taoism Yangism Chan
Greco-Roman	Aristotelianism Atomism Cynicism Cyrenaics Eleatics Eretrian school Epicureanism Hermeneutics Ionian Ephesian Milesian Megarian school Neoplatonism Peripatetic Platonism Pluralism Presocratic Pyrrhonism Pythagoreanism Neopythagoreanism Sophistic Stoicism
Indian	Hindu Samkhya Nyaya Vaisheshika Yoga Mīmāṃsā Ājīvika Ajñana Cārvāka Jain Anekantavada Syādvāda Buddhist Śūnyatā Madhyamaka Yogacara Sautrāntika Svatantrika
Persian	Mazdakism Mithraism Zoroastrianism Zurvanism

Medieval

European	Christian Augustinianism Scholasticism Thomism Scotism Occamism Renaissance humanism
East Asian	Korean Confucianism Edo neo-Confucianism Neo-Confucianism
Indian	Vedanta Acintya bheda abheda Advaita Bhedabheda Dvaita Nimbarka Sampradaya Shuddhadvaita Vishishtadvaita Navya-Nyāya
Islamic	Averroism Avicennism Illuminationism ʿIlm al-Kalām Sufi
Jewish	Judeo-Islamic

Modern

People

Anarchism
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Individualism
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Natural law
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Neo-scholasticism
Pragmatism
Phenomenology
Positivism
Reductionism
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Social contract
Socialism
Transcendentalism
Utilitarianism

Contemporary

Analytic	Applied ethics Analytic feminism Analytical Marxism Communitarianism Consequentialism Critical rationalism Experimental philosophy Falsificationism Foundationalism / Coherentism Internalism and externalism Logical positivism Legal positivism Normative ethics Meta-ethics Moral realism Quinean naturalism Ordinary language philosophy Postanalytic philosophy Quietism Rawlsian Reformed epistemology Systemics Scientism Scientific realism Scientific skepticism Transactionalism Contemporary utilitarianism Vienna Circle Wittgensteinian
Continental	Critical theory Deconstruction Existentialism Feminist Frankfurt School New Historicism Hermeneutics Neo-Marxism Phenomenology Posthumanism Postmodernism Post-structuralism Social constructionism Structuralism Western Marxism
Other	Kyoto School Objectivism Postcritique Russian cosmism more...

Positions

Aesthetics	Formalism Institutionalism Aesthetic response
Ethics	Consequentialism Deontology Virtue
Free will	Compatibilism Determinism Hard Incompatibilism Hard Libertarianism
Metaphysics	Atomism Dualism Idealism Monism Naturalism Realism
Epistemology	Empiricism Fideism Naturalism Particularism Rationalism Skepticism Solipsism
Mind	Behaviorism Emergentism Eliminativism Epiphenomenalism Functionalism Objectivism Subjectivism
Normativity	Absolutism Particularism Relativism Nihilism Skepticism Universalism
Ontology	Action Event Process
Reality	Anti-realism Conceptualism Idealism Materialism Naturalism Nominalism Physicalism Realism

By region
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Miscellaneous	Amerindian Aztec Yugoslav Romanian Russian

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Glossary · Outline · A–Z index · Featured content

Academic Branches of Philosophy

Philosophy ponders the most fundamental questions humankind has been able to ask. These are increasingly numerous and over time they have been arranged into the overlapping branches of the philosophy tree:

Aesthetics: What is art? What is beauty? Is there a standard of taste? Is art meaningful? If so, what does it mean? What is good art? Is art for the purpose of an end, or is "art for art's sake?" What connects us to art? How does art affect us? Is some art unethical? Can art corrupt or elevate societies?
Epistemology: What are the nature and limits of knowledge? What is more fundamental to human existence, knowing (epistemology) or being (ontology)? How do we come to know what we know? What are the limits and scope of knowledge? How can we know that there are other minds (if we can)? How can we know that there is an external world (if we can)? How can we prove our answers? What is a true statement?
Ethics: Is there a difference between ethically right and wrong actions (or values, or institutions)? If so, what is that difference? Which actions are right, and which wrong? Do divine commands make right acts right, or is their rightness based on something else? Are there standards of rightness that are absolute, or are all such standards relative to particular cultures? How should I live? What is happiness?
Logic: What makes a good argument? How can I think critically about complicated arguments? What makes for good thinking? When can I say that something just does not make sense? Where is the origin of logic?
Metaphysics: What sorts of things exist? What is the nature of those things? Do some things exist independently of our perception? What is the nature of space and time? What is the relationship of the mind to the body? What is it to be a person? What is it to be conscious? Do gods exist?
Political philosophy: Are political institutions and their exercise of power justified? What is justice? Is there a 'proper' role and scope of government? Is democracy the best form of governance? Is governance ethically justifiable? Should a state be allowed? Should a state be able to promote the norms and values of a certain moral or religious doctrine? Are states allowed to go to war? Do states have duties against inhabitants of other states?