`BookProof.ChapterA3x.projSym_mul_projMixed` {N : ℕ} (hN : 2 ≤ N) : projSym N * projMixed N = 0

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`BookProof.ChapterA3x.projSym_mul_projMixed` {N : ℕ} (hN : 2 ≤ N) : projSym N * projMixed N = 0 · Prove2Me