- #1
economicsnerd
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Let ##u,v## be vectors in the same Euclidean space, and define the symmetric matrix ##M = uv'+vu'##, the sum of their two outer products.
I'm interested in whether or not ##M## is positive (semi)definite.
Does anybody know of any equivalent conditions that I might phrase "directly" in terms of the vectors ##u,v##?
I'm interested in whether or not ##M## is positive (semi)definite.
Does anybody know of any equivalent conditions that I might phrase "directly" in terms of the vectors ##u,v##?