Power expression in denominator?

[Boris Kheyfets]

Ho do I cancel expression in a denominator:

                   2/3
               -8⋅2
─────────────────────────────────────
                                  7/4
  3 ___         22/3 ⎛     1     ⎞
3⋅╲╱ ν ⋅(yᵢ - 1)    ⋅⎜───────────⎟
                     ⎜        8/3⎟
                     ⎝(yᵢ - 1)   ⎠

Expression:

-8*2**(2/3)/(3*nu**(1/3)*(y_i - 1)**(22/3)*((y_i - 1)**(-8/3))**(7/4))

[Aaron Meurer]

The issue is that you have a nested power. x**a**b != x**(a*b) in
general (see http://docs.sympy.org/latest/tutorial/simplification.html#powers),
so SymPy doesn't simplify this automatically.

The solution should be to use powdenest, but it seems that
powdenest(force=True) is not working for me. So this is a bug. I
opened https://code.google.com/p/sympy/issues/detail?id=4022 for it.

Aaron Meurer

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[Boris Kheyfets]

Thanks.

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