I didn't want to open an issue before asking here, because for all I know there could be a very good reason for this.
In [1]: Poly(-5*x**3, x).div(Poly(3*x, x)) Out[1]: (Poly(0, x, domain='ZZ'), Poly(-5*x**3, x, domain='ZZ')) In [2]: Poly(-5*x**3, x, field=True).div(Poly(3*x, x, field=True)) Out[2]: (Poly(-5/3*x**2, x, domain='QQ'), Poly(0, x, domain='QQ')) I understand that it doesn't want to create field coefficients, but I thought that the definition of polynomial division and remainder was that a.div(b) returns q and r such that a == b*q + r and **either r == 0 or deg(r) < deg(b)**. [1] obviously does not satisfy this second condition. So what definition does it use? This is causing problems in the Risch algorithm. It seems like I need to be using field=True every time I create a Poly, or else I will get wrong results. But then that gives things like gcd() problems. By the way, I know about pdiv. But I think regular div() should be returning results with field coefficients if it must to satisfy the definition, unless I am seriously missing something. Aaron Meurer -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sy...@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
