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theorem proved term proof

succ_le_succ

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formal statement (Lean)

 350theorem succ_le_succ {a b : LogicNat} (h : a ≤ b) : succ a ≤ succ b := by

proof body

Term-mode proof.

 351  obtain ⟨k, hk⟩ := h
 352  refine ⟨k, ?_⟩
 353  show succ a + k = succ b
 354  rw [succ_add, hk]
 355

used by (9)

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depends on (4)

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