Comment #3 on issue 1538 by smichr: root of negative number in denominator
http://code.google.com/p/sympy/issues/detail?id=1538
Assuming a is positive, you cannot change (-a)**(-p/q) to (-1/a)**(q/p);
you have to
take care of the -1 in the base to give -(-1)**((p%q)/q)*(1/a)**(q/p).
Fixes to negative rational powers with integer or rational bases is
attached.
I checked a negative real base with a rational power and did not run into
the same error.
/c
Attachments:
0001-neg-rational-power-with-negative-rat-and-int-base-fi.patch 2.7 KB
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