On Tue, Sep 23, 2014 at 11:39 AM, Ian Kelly <ian.g.ke...@gmail.com> wrote: > I'm not convinced it's all that clear. In addition to Mathworld and > Wikipedia that were already cited, ProofWiki provides an actual proof > that gcd(a, b) = gcd(|a|, |b|), by way of noting that a and |a| have > the same factors.
I forgot to include the link: https://proofwiki.org/wiki/GCD_for_Negative_Integers -- https://mail.python.org/mailman/listinfo/python-list
