If, for n and d integers, the ratio n/d is itself an integer, then d is said to divide n. This relationship is written d|n, read "d divides n." In this case, n is also said to be divisible by d and d is called a divisor of n.
http://mathworld.wolfram.com/Divides.html |
发表于 2004-2-9 06:17:37
发表于 2004-2-9 07:07:51