`BookProof.ChapterAbelianDiagonalCountable.diagOp_coordUnit_apply` (i : ℕ) (f : Ell2C) (j : ℕ) : ((diagOp (coordUnit i) f : Ell2C) : ℕ → ℂ) j = if j = i then (f : ℕ → ℂ) i else 0

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`BookProof.ChapterAbelianDiagonalCountable.diagOp_coordUnit_apply` (i : ℕ) (f : Ell2C) (j : ℕ) : ((diagOp (coordUnit i) f : Ell2C) : ℕ → ℂ) j = if j = i then (f : ℕ → ℂ) i else 0 · Prove2Me