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Student Support Forum: 'How to use assumption during Refine or Simplify' topicStudent Support Forum > General > "How to use assumption during Refine or Simplify"

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John Wayne
09/09/12 1:18pm

Hi,

I have a certain case of covariance to simplify.

Suppose I have the following expression:
cov=(ea+ex)(ea+ey)=eaea+eaex+eaey+exey

How can I assume that whenever ex times ey ,the product is 0, so that the expression I want to get out of is

Assuming[exey=0,Refine[cov]]=eaea+eaex+eaey
So that the last term,exey, drops out.

My problem is that the Assuming[] function won't take exey=0 as a valid assumption. Is there any way to do this using some other function or I typed something wrong?

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Subject (listing for 'How to use assumption during Refine or Simplify')
Author Date Posted
How to use assumption during Refine or Simplify John Wayne 09/09/12 1:18pm
Re: How to use assumption during Refine or Simp... Bill Simpson 09/09/12 11:02pm
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