lean4-htt/tests/lean/run/1234.lean
2022-06-21 15:35:47 -07:00

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theorem le_of_not_lt {a b : Nat} (_: ¬ a < b): b ≤ a := sorry
theorem lt_of_succ_lt (_: a + 1 < b): a < b := sorry
theorem succ_pred_eq_of_pos (_: 0 < v): v - 1 + 1 = v := sorry
set_option trace.Meta.Tactic.simp true
--set_option trace.Debug.Meta.Tactic.simp true
example (h₁: k ≤ v - 1) (h₂: 0 < v):
(if k ≤ v - 1 then Fin.mk (v-1+1) sorry else Fin.mk (v-1) sorry) = Fin.mk v sorry (n:=n) := by
simp only [
h₁, h₂,
ite_true,
succ_pred_eq_of_pos
----------------
, le_of_not_lt
, lt_of_succ_lt
]
-- it works
example (h₁: k ≤ v - 1) (h₂: 0 < v):
(if k ≤ v - 1 then Fin.mk (v-1+1) sorry else Fin.mk (v-1) sorry) = Fin.mk v sorry (n:=n) := by
simp (config := { memoize := false}) only [
h₁, h₂,
ite_true,
succ_pred_eq_of_pos
----------------
, le_of_not_lt
, lt_of_succ_lt
]
example (h₁: k ≤ v - 1) (h₂: 0 < v):
(if k ≤ v - 1 then Fin.mk (v-1+1) sorry else Fin.mk (v-1) sorry) = Fin.mk v sorry (n:=n) := by
simp only [
h₁, h₂,
ite_true,
succ_pred_eq_of_pos
----------------
--, le_of_not_lt
--, lt_of_succ_lt
]