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lemma proved wrapper

extendMask_notin

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formal statement (Lean)

  39@[simp] lemma extendMask_notin (M : Finset (Fin n)) (a : {i // i ∈ M} → Bool) {i : Fin n} (h : i ∉ M) :
  40  extendMask (n:=n) M a i = false := by

proof body

One-line wrapper that applies simp.

  41  simp [extendMask, h]
  42

depends on (3)

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