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Re: Help needed: How to add constraints into FullSimplify


Ilya:

expr = x1^2 + x5^2 + x7^2;

Simplify[expr x^2 + 2 expr x + 3, {expr == 1}]

        3 + 2*x + x^2

FullSimplify[expr x^2 + 2 expr x + 3, {expr == 1}]

        3 + x*(2 + x)

Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
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"Ilya Zavorin" <iaz at cs.umd.edu> wrote in message
news:897dgc$5p6 at smc.vnet.net...
> Hi!
>
> I am trying to simplify a complicated expression F[x1,x2,...] using
> FullSimplify.  What I know is that the variables involved satisfy
> certain conditions. For instance, I know that
>
> x1^2 + x5^2 + x7^2 = 1.
>
> How can I supply this information into FullSimplify so that it
> processes input further?
>
> Thanks,
>
> Ilya
>



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