Even
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In mathematics, the term even is used in several senses:
- an integer is called even if it is divisible by two; see even and odd numbers
- a function f defined on the real numbers is called even if f(x) = f(−x) for all x; see even and odd functions
- a permutation of a finite set is called even if it can be written as a composition of an even number of transpositions; see even and odd permutations