Case $r=1$ of Edelman's bound: $\mathbb P\{\|g\|^2\le t\}$ is the $\chi^2_k$ integral (equality)

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Case $r=1$ of Edelman's bound: $\mathbb P\{\|g\|^2\le t\}$ is the $\chi^2_k$ integral (equality) · Prove2Me