[sage-devel] Re: j_invariants of different types for different fields

2009-09-11 Thread John Cremona
Just to say that Jenny and I sorted this out off-list (essentially by replacing QQ wuth ZZ). John On Sep 10, 7:27 pm, Robert Bradshaw rober...@math.washington.edu wrote: On Sep 10, 2009, at 5:24 AM, J. Cooley wrote: Hi I'm trying to write some code involving isogenies that will work over

[sage-devel] Re: j_invariants of different types for different fields

2009-09-10 Thread Robert Bradshaw
On Sep 10, 2009, at 5:24 AM, J. Cooley wrote: Hi I'm trying to write some code involving isogenies that will work over different types of fields (at least rational and finite and hopefully number fields too.) Cool. Part of the code includes the line: fp.numerator()-j*fp.denominator()