Issue #14 resolved
expairseq constructor cancels infinity objects
From Sage issue #13587:
sage: t = tan(x)^2 - tan(x) sage: t.subs(x=pi/2) 0 sage: u = gamma(x) - gamma(x-1) sage: u.subs(x=-1) 0
This is due to the fact that
construct_from_* methods in
expairseq cancel out infinity objects before we can reach
Patch coming up.