matita/matita/contribs/lambda-delta/Basic-2/substitution/lift_weight.ma

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  14
  15 include "Basic-2/syntax/weight.ma".
  16 include "Basic-2/substitution/lift.ma".
  17
  18 (* RELOCATION ***************************************************************)
  19
  20 lemma tw_lift: ∀d,e,T1,T2. ↑[d, e] T1 ≡ T2 → #T1 = #T2.
  21 #d #e #T1 #T2 #H elim H -d e T1 T2; normalize //
  22 qed.