Question: A.1. Prove that there exists a vector > > 0 such that Ax _ b, if and only if for each y 2 0 satisfying

A.1. Prove that there exists a vector > > 0 such
A.1. Prove that there exists a vector > > 0 such that Ax _ b, if and only if for each y 2 0 satisfying y A 2 0 one has y b > 0

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