`BookProof.ChapterF4.mgSum_decrement` (c : ι → ℕ) : (∑ a, (c a - 1)) + mgSupport c = ∑ a, c a · Prove2Me

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`BookProof.ChapterF4.mgSum_decrement` (c : ι → ℕ) : (∑ a, (c a - 1)) + mgSupport c = ∑ a, c a · Prove2Me