Comment #1 on issue 3316 by [email protected]: Expr.expand: the result
depends on the order in which hints are traversed.
http://code.google.com/p/sympy/issues/detail?id=3316
While there are some general principles that govern order, e.g. log >
multinomial > mul (i.e. log should come first). But I'm not sure that a
given order will always work to expand an expression fully. But with the
recent changes that have been made to expand, I don't think it too
unreasonable to just iterate over a given set of hints until there is no
change in the expression. Order will still matter in the case of something
like
x = symbols('x', positive=True)
expand_multinomial(log((x+1)**2))
log(x**2 + 2*x + 1)
expand(log((x+1)**2))
2*log(x + 1)
So I'm not sure there can be a better approach. There is not always a
unique expansion.
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