5a34ffb9b0
This PR upstreams much of the material from `Mathlib/Data/Nat/Init.lean` and `Mathlib/Data/Nat/Basic.lean`.
15 lines
423 B
Text
15 lines
423 B
Text
def f : Nat → Nat := fun x => x - x
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@[simp] theorem f_zero (n : Nat) : f n = 0 :=
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Nat.sub_self n
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example (n : Nat) : False := by
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let g := f n
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have : g + n = n := by
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fail_if_success simp (config := { zeta := false }) [Nat.zero_add, -Nat.add_eq_right] -- Should not succeed
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simp [g]
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sorry
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example (h : a = b) : (fun x => a + x) 0 = b := by
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fail_if_success simp (config := { beta := false })
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simp [*]
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