1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
15 include "basic_2/grammar/ceq.ma".
17 (* CONTEXT-SENSITIVE EQUIVALENCES FOR TERMS *********************************)
19 (* Main properties **********************************************************)
21 theorem ceq_trans (L): Transitive … (ceq L).
24 lemma ceq_canc_sn (L): left_cancellable … (ceq L).
27 lemma ceq_canc_dx (L): right_cancellable … (ceq L).
30 theorem cfull_trans (L): Transitive … (cfull L).
33 lemma cfull_canc_sn (L): left_cancellable … (cfull L).
36 lemma cfull_canc_dx (L): right_cancellable … (cfull L).