On Mon, Nov 24, 2008 at 4:46 PM, Tim Lahey <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> Is there a specific way to add rules (and apply them) to rewrite
> expressions in Sage?
>
> Such as, log(a)-log(b) = log(a/b)
>
> I need this (and others) in order to properly compare the integration
> results from Sage to the list of integrals I have. I'm trying to put
> together a suite of integration tests for both correctness and timing.

I don't know if one can do the above (maybe with pynac it is possible).
However, in the meantime could you at least "improperly" compare
the results for "pseudo"-correctness by evaluating both answers
at a bunch of randomly chosen points and see if they differ by a constant?

William

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