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单词 Smallest common multiple
释义

Smallest common multiple

中文百科

最小公倍数 Least common multiple

(重定向自Smallest common multiple)

最小公倍数是数论中的一个概念。若有一个数X,可以被另外两个数A、B整除,且X大于(或等于)A和B,则X为A和B的公倍数。A和B的公倍数可以有很多个,而所有的公倍数中,最小的公倍数就叫做最小公倍数。两个整数公有的倍数称为它们的公倍数,其中最小的一个正整数称为它们两个的最小公倍数。同样地,若干个整数公有的倍数中最小的正整数称为它们的最小公倍数。n整数a_1, a_2, \cdots , a_n的最小公倍数一般记作:[a_1, a_2, \cdots , a_n],或者参照英文记法记作\operatorname{lcm}(a_1, a_2, \cdots , a_n),其中lcm是英语中“最小公倍数”一词(lowest common multiple)的首字母缩写。

例如,十天干和十二地支的混合称为一个阴历年,干支循环回归同一名称的所需时间,就是1210的最小公倍数,即是60──一个「甲子」。

英语百科

Least common multiple 最小公倍数

(重定向自Smallest common multiple)
LCMs of numbers 1 through 10 with numbers 2 through 10. Line labels = first number. X axis = second number minus 1. Y axis = LCM of the two numbers.
A Venn Diagram showing the least common multiples of combinations of 2, 3, 4, 5 and 7 (6 is skipped as it is 2 × 3, both of which are already represented).For example, a card game which requires its cards to be divided equally among up to 5 players requires at least 60 cards, the number at the intersection of the 2, 3, 4 and 5 sets, but not the 7 set.

In arithmetic and number theory, the least common multiple (also called the lowest common multiple or smallest common multiple) of two integers a and b, usually denoted by LCM(a, b), is the smallest positive integer that is divisible by both a and b. Since division of integers by zero is undefined, this definition has meaning only if a and b are both different from zero. However, some authors define lcm(a,0) as 0 for all a, which is the result of taking the lcm to be the least upper bound in the lattice of divisibility.

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