3 lines
76 B
Text
3 lines
76 B
Text
|
|
theorem ex {a : Prop} (H : ¬a) : a ↔ false :=
|
|
iff.intro H (false.rec a)
|
|
|
theorem ex {a : Prop} (H : ¬a) : a ↔ false :=
|
|
iff.intro H (false.rec a)
|