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`BookProof.ChapterA3p.tensorSquare_complete_reducibility` : projSym 2 + projAnti 2 = 1 ∧ projSym 2 * projAnti 2 = 0 ∧ projAnti 2 * projSym 2 = 0 ∧ projSym 2 * projSym 2 = projSym 2 · Prove2Me