Hi SAGE developers, I have a question regarding quotient fields of polynomial rings. I want to iterate a polynomial in two variables over a finite field and need to mod out higher powers. So I defined a finite field, a polynomial ring, a quotient ring and a polynomial in it:
F.<a>=FiniteField(5) R.<t>=PolynomialRing(F) Q.<t>=R.quotient_ring(R.ideal(t^50)) p=1+2*t^3+t^5 Now doing p(p) SAGE tells me that p is not callable: TypeError: 'QuotientRingElement' object is not callable If I define p in the polynomial ring however it works fine and I could mod out the t^50 ideal later on doing p(p(p)).mod(t^50). The problem is that for large moduli it is quiet slow first producing the iterate and then moding out a lot of terms, especially if the polynomial has a larger degree or has two variables. Doing the calculations in the quotient ring should only produce the needed terms and calculations should be faster, right? Is there a method to iterate a polynomial living in the quotient ring? Why am I getting the not callable message above? Looking forward to any help. Best M. -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
