Proposition 2.8(i) — $\operatorname{zer}(M+S)$ is a closed convex subset of $\mathcal P\times\mathcal D$

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Proposition 2.8(i) — $\operatorname{zer}(M+S)$ is a closed convex subset of $\mathcal P\times\mathcal D$ · Prove2Me