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((refimprove|date=April 2022))

((Short description|Mathematics book written by William Oughtred))
'''''Clavis mathematicae''''' (English: '''''The Key of Mathematics''''') is a [[mathematics]] book written by [[William Oughtred]], originally published in 1631 in Latin. It was an attempt to communicate the contemporary mathematical practices, and the European history of mathematics, into a concise and digestible form. The book contains an addition in its 1647 English edition, "Easy Way of Delineating Sun-Dials by Geometry", which had been written by Oughtred earlier in life. The original edition brought the autodidactic Oughtred acclaim amongst mathematicians, but the English-language reissue brought him celebrity, especially amongst tradesman who made use of the arithmetic in their labors. The book is also notable for using the symbol "x" for multiplication, a method invented by Oughtred.<ref>((Cite web|title=Mathematical Treasure: William Oughtred’s The Key of the Mathematicks ((!)) Mathematical Association of America|url=https://www.maa.org/press/periodicals/convergence/mathematical-treasure-william-oughtred-s-the-key-of-the-mathematicks|access-date=2022-02-20|website=www.maa.org))</ref><ref>((Cite web|title=Clavis Mathematicae ((!)) work by Oughtred ((!)) Britannica|url=https://www.britannica.com/topic/Clavis-Mathematicae|access-date=2022-02-20|website=www.britannica.com|language=en))</ref>

==References==
((reflist))

[[Category:1631 books]]
[[Category:Mathematics books]]

((mathematics-book-stub))

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