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一个今天想多了的问题:
factors里面包不包括负因数?
回答:
Doctor Greenie:
“But I think you will find a difference of opinion about -3 being a
factor of 3. In my opinion, in most contexts, factors of a number are
only positive integers. The prime factorization of a number "n" is the
unique set of positive prime numbers which, when multiplied together,
yield the number n. And when we list "the factors of" a number, we
only list positive integer divisors. The "factors" of 6 are 1, 2, 3,
and 6; we don't include -1, -2, -3, or -6 in the list.“
相关链接:
http://mathforum.org/library/drmath/view/63516.html
结论:认同factors里面不包括负的因数。
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