12 lines
304 B
Text
12 lines
304 B
Text
open Classical
|
|
|
|
theorem ex : if (fun x => x + 1) = (fun x => x + 2) then False else True := by
|
|
have (fun x => x + 1) ≠ (fun x => x + 2) by
|
|
intro h
|
|
have 1 = 2 from congrFun h 0
|
|
contradiction
|
|
rw [ifNeg this]
|
|
exact True.intro
|
|
|
|
def tst (x : Nat) : Bool :=
|
|
if 1 < 2 then true else false
|