Let $x^TAx\leq 1$ and $y^TAy\leq 1$; $x,y\in R^{n\times 1}$. $A$ is a positive semidefinite matrix. Does it imply $x^TAy\leq1$?
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closed as too localized by Denis Serre, Igor Rivin, Angelo, Will Jagy, Goldstern Dec 14 at 22:34 |
