§4.1, p. 33 — a linear map on ℝⁿ is permutation equivariant iff it is α·I + β·(1/n)𝟙𝟙ᵀ

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§4.1, p. 33 — a linear map on ℝⁿ is permutation equivariant iff it is α·I + β·(1/n)𝟙𝟙ᵀ · Prove2Me