matita/matita/contribs/lambdadelta/basic_2/etc_2A1/xpr/xpr_aaa.etc

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  14
  15 include "basic_2/static/ssta_aaa.ma".
  16 include "basic_2/reducibility/cpr_aaa.ma".
  17 include "basic_2/reducibility/xpr.ma".
  18
  19 (* EXTENDED PARALLEL REDUCTION ON TERMS *************************************)
  20
  21 (* Properties on atomic arity assignment for terms **************************)
  22
  23 lemma xpr_aaa: ∀h,g,L,T,A. L ⊢ T ⁝ A → ∀U. ⦃h, L⦄ ⊢ T •➡[g] U → L ⊢ U ⁝ A.
  24 #h #g #L #T #A #HT #U * /2 width=3/ /2 width=6/
  25 qed.