# Commutative operation

A commutative function $$f$$ is a function that takes multiple inputs from a set $$X$$ and produces an output that does not depend on the ordering of the inputs. For example, the binary operation $$+$$ is commutative, because $$3 + 4 = 4 + 3.$$ The string concatenation function concat is not commutative, because concat("3","4")="34" does not equal concat("4","3")="43".

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• Mathematics

Mathematics is the study of numbers and other ideal objects that can be described by axioms.