# 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.