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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.
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Equational logic can be combined with first order logic. Much of equational logic is derived from first order logic.
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Equational languages are formal languages made up of countable variables, function symbols and an equality symbol.
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Sakharov, Alex. "Equational Logic." From MathWorld--A Wolfram Web
Resource, created by Eric W. Weisstein.
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https://www.encyclopediaofmath.org/index.php?title=Equational_logic&oldid=13940
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http://www.encyclopediaofmath.org/index.php?title=Equational_logic&oldid=13940
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Equational logic. Jan
Mycielski (originator), Encyclopedia of Mathematics. URL:
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Equational logic. Jan
Mycielski (originator), Encyclopedia of Mathematics. URL:
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E, if and only if t = u can be proven from the set of equalities.
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