Lemma 3 — Minkowski bound on $\bigl(\frac1n\sum_i\|[\hat Q_n(x^i)]^{-1}\|^2\bigr)^{1/2}$

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Lemma 3 — Minkowski bound on $\bigl(\frac1n\sum_i\|[\hat Q_n(x^i)]^{-1}\|^2\bigr)^{1/2}$ · Prove2Me