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A property of algebraic operations (cf. Algebraic operation). For addition and multiplication, commutativity is expressed by the formulas \begin{equation} a+b=b+a,\quad \text{ and } \quad ab=ba. \end{equation} A binary operation $*$ is commutative (or, what is the same, satisfies the law of commutativity) if in the given algebraic system the identity $a*b=b*a$ holds

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Commutativity. Encyclopedia of Mathematics. URL:
This article was adapted from an original article by D.M. Smirnov (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article