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4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
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15 include "delayed_updating/substitution/lift_eq.ma".
16 include "ground/lib/list_length.ma".
18 (* LIFT FOR PATH ***********************************************************)
20 (* Constructions with list_length ******************************************)
22 lemma lift_path_length (p) (f):
24 #p elim p -p // * [ #n ] #p #IH #f //
30 >list_length_lcons >list_length_lcons //