On Nov 2, 3:30 am, Alan Bromborsky <[EMAIL PROTECTED]> wrote:
> Suppose you have a calculation where you are simplifying
> r*sin(theta)/sqrt(r**2*sin(theta)**2). Is there a way of specifying
> that r > 0 and 0 < theta < pi so that the result will simplify to 1
> rather than
> r*sin(theta)/(|r||sin(theta)|).
Have you tried this?
>>> r = Symbol('r', positive=True)
>>> r.is_positive
True
More complicated assumptions like 0 < theta < pi is afaik currently
not possible, but hopefully it will be implemented soon:
See http://code.google.com/p/sympy/issues/detail?id=1047&q=assumptions.
Vinzent
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