File size: 243 Bytes
3857cbc | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | new D → ((C ∨ D → A) → (A ∨ F → ((D → E) → ((B ∧ F) ∧ F → (C → (D → D ∧ D)))))) intro intro intro intro intro cases 4 intro cases 4 cases 5 cases 8 intro cases 4 cases 5 cases 8 cases 15 constructor exact 0 exact 0 |