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let T in L(V, W) and v in V. Prove que \|Tv\| = \|T\| \|v\| iff T^* T v = \|T\|^2 v
let T in L(V, W) and v in V. Prove que \|Tv\| = \|T\| \|v\| iff T^* T v = \|T\|^2 v
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