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lemma proved term proof

inBall_mono

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formal statement (Lean)

  29lemma inBall_mono {K : Kinematics α} {x y : α} {n m : Nat}
  30  (hnm : n ≤ m) : inBall K x n y → inBall K x m y := by

proof body

Term-mode proof.

  31  intro ⟨k, hk, hkreach⟩
  32  exact ⟨k, le_trans hk hnm, hkreach⟩
  33
  34end Causality
  35end IndisputableMonolith

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