Hello, I try to perform calculations in GF(2^3); e.g. calculate (x^2+x)(x+1) = x^3 + 2x^2 + x = x^3 + x as polynomial coefficients are modulo-2. Using the irreducible polynomial x^3 + x + 1 I arrive at (x^2+x)(x+1) = 1.
I try to do the same in sympy import sympy as sym import sympy.polys as polys import sympy.polys.galoistools as gft F = polys.domains.FF(2) # x^2 + x a = [1, 1, 0] # x + 1 b = [1, 1] res = gft.gf_mul(a, b, 8, F) sym.pprint(res) but arrive at [1 mod 2, 0 mod 2, 1 mod 2, 0 mod 2] which I interpret as x^3 + x. So it seems that the reduction using the irreducible polynomial is not done - is there a way to do this last step in sympy? Thanks & regards - Clemens -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/eea4971d-65c2-4b16-9fb9-703dcbb4f3d2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
