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How to simplify certain covariance expressions using
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?