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`BookProof.ChapterF6.mgStep_le_apply_add` (k : ℕ) (T : α →₀ ℕ) (x y : α) : T y + (if y = x then 1 else 0) ≤ (mgStep k T x) y + (if 0 < T x ∨ T.support.card < k then 0 else 1) · Prove2Me