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Re: how to solve this problem?

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  • Subject: [mg95117] Re: how to solve this problem?
  • From: Thomas <t.isele at>
  • Date: Wed, 7 Jan 2009 04:06:36 -0500 (EST)

Put this at the beginning:

$Assumptions = {Element[x,Reals],Element[y,Reals]};

instead of Element[x,Reals] you can use x\[Element]Reals

Sometimes you must call Simplify in order to get every expression neatly simlified using that Assumption.

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