Comment #44 on issue 1358 by wflynny: (e*f*e*f).subs(e*f,f*e+h) fails if e*f is not commutative http://code.google.com/p/sympy/issues/detail?id=1358
It seems that the problem is stemming from the Pow class. Example: In [1]: from sympy import Pow In [2]: Pow(-2,-2) Out[2]: -1/4 In [3]: Pow((-2),-2) Out[3]: -1/4 In [4]: Pow((-2),(-2)) Out[4]: -1/4 Shouldn't this be returning 1/4 instead of -1/4? -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en -~----------~----~----~----~------~----~------~--~---