Lemma 2.1 (Hutchinson) — $z^TAz$ is unbiased; for symmetric $A$, $\mathrm{Var}(z^TAz) = 2(\|A\|_F^2

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Lemma 2.1 (Hutchinson) — $z^TAz$ is unbiased; for symmetric $A$, $\mathrm{Var}(z^TAz) = 2(\|A\|_F^2 - \sum_i A_{ii}^2)$ · Prove2Me