It seems to me that after a healthy post-deprecation cycle, and if we choose to keep the Z/2 meaning of __sub__, it might be worth reintroducing __neg__ as a no-op? AFAICT, this is consistent with the Z/2 interpretation?
Eric On Wed, 28 Jun 2017 at 00:08 Nathaniel Smith <n...@pobox.com> wrote: > On Tue, Jun 27, 2017 at 3:09 PM, Robert Kern <robert.k...@gmail.com> > wrote: > > On Tue, Jun 27, 2017 at 3:01 PM, Benjamin Root <ben.v.r...@gmail.com> > wrote: > >> > >> Forgive my ignorance, but what is "Z/2"? > > > > https://groupprops.subwiki.org/wiki/Cyclic_group:Z2 > > https://en.wikipedia.org/wiki/Cyclic_group > > This might be a slightly better link? > https://en.wikipedia.org/wiki/Modular_arithmetic#Integers_modulo_n > > Anyway, it's a math-nerd way of saying "the integers modulo two", i.e. > the numbers 0 and 1 with * as AND and + as XOR. But the nice thing > about Z/2 is that if you know some abstract algebra, then one of the > most fundamental theorems is that if p is prime then Z/p is a "field", > meaning that * and + are particularly well-behaved. And 2 is a prime, > so pointing out that the bools with AND and XOR is the same as Z/2 is > a way of saying "this way of defining * and + is internally consistent > and well-behaved". > > -n > > -- > Nathaniel J. Smith -- https://vorpus.org > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@python.org > https://mail.python.org/mailman/listinfo/numpy-discussion >
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