Hi,
I was curious, so I started to port the algorithm. Now I have this problem:
sage: e = exp(x)+1
sage: f = exp(x)
I need to check, that f is a subexpression of e. In SymPy, I do:
e.subs(f, Symbol("x", dummy=True))==e
i.e. I substitute f for some dummy variable and compare if the
expression has changed. If it did, f is a subexpression of e. In SAGE
however, is there a way how to substitute the whole exp(x) in the
expression (exp(x)+1) by something else?
Thanks,
Ondrej
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