[sage-support] Modular Symbol Projection Function

Hi, I am trying to do some calculations with decomposition factors of modular symbol spaces, for some of which I intend to use the projection function. My problem is that most of the time, when I try to define a projection map onto a modular symbol subspace, I get an error. Sometimes the error s

[sage-support] Coefficients in Modular Symbol Spaces

This is perhaps a naive question, but I couldn't find it anywhere. Suppose I have an element of a modular symbol space, which Sage is able to output as a linear combination of Manin symbols. Is there a way to get Sage to give me back an individual coefficient of a particular basis element in that

[sage-support] How to find algorithm behind function

Hi, Apologies if this is a simple question... I've been using Sage to do some modular symbol computations. At some point I discovered the integral_basis() function attached to a modular symbols space. What I am curious about is the following: what's the easiest way to go about finding out the a

[sage-support] Re: modular forms bug(s)?

Thanks all for the replies. As far as the coercion issues go, I generally agree. I'd be happy to have access to a CuspForms(22).zero_element() or CuspForms(22)(0), and start my summation there. Re: I agree with William for the defaults.

[sage-support] modular forms bug(s)?

f weight 2 over Rational Field' So there are probably at least two different issues. For the record: sage: b[0]+b[1] q + q^2 - q^3 - 4*q^4 + q^5 + O(q^6) Is this my doing? Is there a work-around at present? Thanks, Jay --~--~-~--~~~---~--~~ To post to this gro