matita/matita/contribs/lambdadelta/delayed_updating/syntax/prototerm_constructors_eq.ma

   1 (**************************************************************************)
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   3 (*      ||M||                                                             *)
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   5 (*      ||T||                                                             *)
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  10 (*       \ /        This file is distributed under the terms of the       *)
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  14
  15 include "delayed_updating/syntax/prototerm_constructors.ma".
  16 include "ground/lib/subset_ext_equivalence.ma".
  17
  18 (* CONSTRUCTORS FOR PROTOTERM ***********************************************)
  19
  20 (* Constructions with equivalence for prototerm *****************************)
  21
  22 lemma iref_eq_repl (t1) (t2) (k):
  23       t1 ⇔ t2 → 𝛕k.t1 ⇔ 𝛕k.t2.
  24 /2 width=1 by subset_equivalence_ext_f1_bi/
  25 qed.