Am 07.12.2014 um 01:30 schrieb Ondřej Čertík:
However, then, when you subtract this, you need to write this as:
log(a*b) - log(a) - log(b) = 2*pi*I*n
Wouldn't you need to write
> log(a*b) = log(a) + log(b)
as
> log(a*b) = log(a) + log(b) + 2*pi*I*n
as well?
I think there is probably a way to simplify things in many cases, but
it seems it is much more complicated than just using single values on
a principal branch, as we do in sympy currently.
Then we're already missing equalities that combine the value from the
principal branch with the value from any nonprincipal branch.
E.g. we wouldn't find all equalities on expressions that combine sin x
and sin 2x (for one trivial example). And there are interesting
equalities of that kind out there.
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