+(**************************************************************************)
+(* ___ *)
+(* ||M|| *)
+(* ||A|| A project by Andrea Asperti *)
+(* ||T|| *)
+(* ||I|| Developers: *)
+(* ||T|| A.Asperti, C.Sacerdoti Coen, *)
+(* ||A|| E.Tassi, S.Zacchiroli *)
+(* \ / *)
+(* \ / This file is distributed under the terms of the *)
+(* v GNU Lesser General Public License Version 2.1 *)
+(* *)
+(**************************************************************************)
+
(* Istruzioni:
http://mowgli.cs.unibo.it/~tassi/exercise-natural_deduction.html
apply rule (⇒_i [h2] (F ∧ L ⇒ E));
apply rule (⇒_i [h3] (E));
apply rule (∨_e (G∨¬G) [h4] (E) [h4] (E));
- [ apply rule (lem EM);
+ [ apply rule (lem 0 EM);
| apply rule (⇒_e (G∧L⇒E) (G∧L));
[ apply rule (discharge [h2]);
| apply rule (∧_i (G) (L));
apply rule (⇒_i [h3] (H ⇒ E));
apply rule (⇒_i [h4] (E));
apply rule (∨_e (G∨¬G) [h5] (E) [h5] (E));
- [apply rule (lem EM);
+ [apply rule (lem 0 EM);
| apply rule (∨_e (E∨F) [h6] (E) [h6] (E));
[ apply rule (⇒_e (H ⇒ E∨F) (H));
[ apply rule (discharge [h2]);
]
]
(*END*)
-qed.
\ No newline at end of file
+qed.