matita/matita/contribs/lambdadelta/ground_2/relocation/nstream_isid.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
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  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU General Public License Version 2                  *)
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  13 (**************************************************************************)
  14
  15 include "ground_2/notation/functions/identity_0.ma".
  16 include "ground_2/relocation/rtmap_isid.ma".
  17
  18 (* RELOCATION N-STREAM ******************************************************)
  19
  20 (* Specific inversion lemmas ************************************************)
  21
  22 lemma isid_inv_seq: ∀f,n. 𝐈❪n⨮f❫ → 𝐈❪f❫ ∧ 0 = n.
  23 #f #n #H elim (isid_inv_gen … H) -H
  24 #g #Hg #H elim (push_inv_seq_dx … H) -H /2 width=1 by conj/
  25 qed-.