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`BookProof.ChapterSpectralDirectSum.inner_eq_zero_of_le_orthogonal` {M N : Submodule ℂ H} (h : M ≤ Nᗮ) {a b : H} (ha : a ∈ M) (hb : b ∈ N) : inner ℂ a b = 0 · Prove2Me