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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 *)
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15 include "static_2/syntax/teqx.ma".
16 include "static_2/syntax/teqo.ma".
18 (* SORT-IRRELEVANT OUTER EQUIVALENCE FOR TERMS ******************************)
20 (* Properties with sort-irrelevant equivalence for terms ********************)
22 lemma teqx_teqo: ∀T1,T2. T1 ≛ T2 → T1 ⩳ T2.
23 #T1 #T2 * -T1 -T2 /2 width=1 by teqo_sort, teqo_pair/