Parity (mathematics)

In mathematics, parity is the property of an integer of whether it is even or odd. An integer is even if it is a multiple of two, and odd if it isn’t. For example, −4, 0, 82 are even because By contrast, −3, 5, 7, 21 are odd numbers. The above definition of parity applies only to integer numbers, hence it cannot be applied to numbers like 1/2 or 4.201. See the section “Higher mathematics” below for some extensions of the notion of parity to a larger class of “numbers” or in other more general settings.