`BookProof.ChapterEll2Separable.eq_sum_single_of_mem_finSupport` (f : Ell2) {s : Finset ℕ} (hs : Function.support ((f : ℕ → ℝ)) ⊆ (s : Set ℕ)) : f = ∑ i ∈ s, lp.single 2 i ((f : ℕ

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`BookProof.ChapterEll2Separable.eq_sum_single_of_mem_finSupport` (f : Ell2) {s : Finset ℕ} (hs : Function.support ((f : ℕ → ℝ)) ⊆ (s : Set ℕ)) : f = ∑ i ∈ s, lp.single 2 i ((f : ℕ · Prove2Me