File size: 236 Bytes
3857cbc | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | new (C ∨ F → F) → (F → ((F → E) → (D ∧ A → (F ∨ D → (((D ∨ B) ∨ D) ∧ E) ∧ E)))) intro intro intro intro cases 3 cases 3 intro cases 3 constructor constructor left left exact 4 apply 2 exact 1 apply 2 exact 1 |