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-- 22:49, Thursday, January 2, 2020 (UTC)
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-- 23:01, Thursday, January 2, 2020 (UTC)
Mission 1 | Mission 2 | Mission 3 | Mission 4 | Mission 5 | Mission 6 | Mission 7 |
Say Hello to the World | An Invitation to Earth | Small Changes, Big Impact | The Neutral Point of View | The Veil of Verifiability | The Civility Code | Looking Good Together |
-- 23:14, Thursday, January 2, 2020 (UTC)
Mission 1 | Mission 2 | Mission 3 | Mission 4 | Mission 5 | Mission 6 | Mission 7 |
Say Hello to the World | An Invitation to Earth | Small Changes, Big Impact | The Neutral Point of View | The Veil of Verifiability | The Civility Code | Looking Good Together |
-- 01:08, Friday, January 24, 2020 (UTC)
Mission 1 | Mission 2 | Mission 3 | Mission 4 | Mission 5 | Mission 6 | Mission 7 |
Say Hello to the World | An Invitation to Earth | Small Changes, Big Impact | The Neutral Point of View | The Veil of Verifiability | The Civility Code | Looking Good Together |
-- 22:57, Friday, February 7, 2020 (UTC)
Mission 1 | Mission 2 | Mission 3 | Mission 4 | Mission 5 | Mission 6 | Mission 7 |
Say Hello to the World | An Invitation to Earth | Small Changes, Big Impact | The Neutral Point of View | The Veil of Verifiability | The Civility Code | Looking Good Together |
In logic, Birkhoff's theorem states that an equality t = u is a semantic consequence of a set of equalities E, if and only if t = u can be proven from the set of equalities.[1]
According to Birkhoff's theorem, formal languages are considered to be models of natural languages. In mathematical logic, a person creates several classes of formal languages, to which first order logic and equational logic are of the highest importance. [2]
Equational languages are formal languages made up of countable variables, function symbols and an equality symbol. [3]
Equational logic can be combined with first order logic. Much of equational logic is derived from first order logic. [4]
References
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