In mathematics, the parity of an object refers to whether it is even or odd. In particular, any integer is either even or odd according to the following rules: If it is a multiple of two, it is an even number; otherwise, it is an odd number. Examples of even numbers are −4, 8, 0, and 42. Examples of odd numbers are −3, 9, 1, and 71.
The set of even numbers can be written:
Evens = 2Z = {..., −6, −4, −2, 0, 2, 4, 6, ...}.
The set of odd numbers can be shown like this:
Odds = 2Z + 1 = {..., −5, −3, −1, 1, 3, 5, ...}.
2006-12-11 23:39:59 補充:
0(〇)是-1與1之間的整數。0既不是正數,也不是負數。0是偶數。在數論,0不屬於自然數;在集合論和電腦科學中,0屬於自然數。
http://zh.wikipedia.org/wiki/0
2006-12-11 23:48:32 補充:
0是偶數因0可被2整除,所以是偶數,也證明它不是質數