Comment #3 on issue 2260 by [email protected]: 0**0 should be nan http://code.google.com/p/sympy/issues/detail?id=2260
Well, like 1/0 being oo but (1/x).subs(x, 0) being nan, we can at least disallow the substitution from producing 1. This has the side effect of making Basic._compare_pretty sort 0 before 1, now.
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