Small update: Replacing Integers(p^2) by QuotientRing(ZZ, p^2) seems to fix the issue.
Op maandag 8 maart 2021 om 10:34:06 UTC+1 schreef dim...@gmail.com: > On Mon, Mar 8, 2021 at 9:25 AM Alex Braat <alex...@gmail.com> wrote: > > > > Hello, > > > > I have encountered some strange behavior when I evaluate multivariate > polynomials over the integers modulo n. For instance, > > > > In: > > p = 3 > > S = Integers(p^2) > > R.<x,y> = PolynomialRing(S) > > f = x^2 * y^2 > > print(f([S(p),S(1)]), f([S(1), S(p)])) > > > > Out: > > 1 0 > > > > while both evaluations should ofcourse be equal to 0. This does not > depend on the prime p, and is consistent in both of these versions of > SageMath: > > looks like a bug (also in the 9.3.beta7) > sage: f(S(3),S(1)) > 1 > > > > > > 'SageMath version 8.7, Release Date: 2019-03-23' > > 'SageMath version 9.2, Release Date: 2020-10-24' > > > > Am I doing something wrong or is this a bug? > > > > -- > > You received this message because you are subscribed to the Google > Groups "sage-support" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to sage-support...@googlegroups.com. > > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-support/e3b67e84-1d8b-46e4-b0dd-5558f6d4929bn%40googlegroups.com > . > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/c860111e-aeea-43ff-b6c5-5c392e590789n%40googlegroups.com.
