matita/matita/contribs/lambdadelta/delayed_updating/substitution/lift_prototerm.ma

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  14
  15 include "delayed_updating/substitution/lift_path.ma".
  16 include "delayed_updating/syntax/prototerm.ma".
  17 include "ground/lib/subset_ext.ma".
  18
  19 (* LIFT FOR PROTOTERM *******************************************************)
  20
  21 interpretation
  22   "lift (prototerm)"
  23   'UpArrow f t = (subset_ext_f1 ? ? (lift_path f) t).
  24
  25 (* Basic constructions ******************************************************)
  26
  27 lemma in_comp_lift_path_term (f) (t) (p):
  28       p ϵ t → ↑[f]p ϵ ↑[f]t.
  29 /2 width=1 by subset_in_ext_f1_dx/
  30 qed.