Comment #13 on issue 1026 by asmeurer: pypy doesn't run sympy http://code.google.com/p/sympy/issues/detail?id=1026
Well, I can tell you the logcombine thing has come up before. I thought it was changed to use in, but I guess not. Anyway, it should be "assert logcombine(cos(-2*log(z)+b*log(w))) in [cos(log(w**b/z**2)), cos(log(z**2/w**b))]" (because cos is even, it doesn't matter if you pull a -1 out of the log by inverting the fraction).
The rest are a little more disturbing. Maybe for the ae tests, it just needs to increase the tolerance against 0.
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