Hi all, I've been using the functions associated with the GCAlgebra class to compute some minimal models for given cohomology algebras. It works fine whenever my cohomology algebra has 2 or more generators, but I can't get it to accept a single generator. I am trying, for example:
D.<x> = GradedCommutativeAlgebra(QQ, degrees = (2,)) d = D.differential({x:0,}) D = D.cdg_algebra(d) I = D.ideal(x^3) R = D.quotient(I)
It always fails on the quotient, the objection is that " 'homomorphisms of graded commutative ' 1325 'algebras have only been implemented ' 1326 'when the base rings are the same' "
I don't get it, pretty printing all objects shows they are all over the rational field. I did figure out that you need a comma to define a single-element tuple otherwise you get "not iterable" errors, but I think that's solved now. Any ideas?
To contrast, something like this runs fine:
D.<x,y> = GradedCommutativeAlgebra(QQ, degrees = (2,2)) d = D.differential({x:0, y:0}) D = D.cdg_algebra(d) I = D.ideal([x^2-y^2,x*y,x^3,y^3]) R = D.quotient(I)
Note: it doesn't help to change D.ideal(x^3) to D.ideal([x^3]) or D.ideal([x^3,])...I thought maybe it expected a tuple. I've also seen examples where things like ideal(x^3) are written, so that shouldn't be an issue.
Thanks, Russ
