matita/matita/contribs/lambdadelta/basic_2/etc/xpr/xprs_aaa.etc

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  14
  15 include "basic_2/reducibility/xpr_aaa.ma".
  16 include "basic_2/computation/xprs.ma".
  17
  18 (* EXTENDED PARALLEL COMPUTATION ON TERMS ***********************************)
  19
  20 (* Properties on atomic arity assignment for terms **************************)
  21
  22 lemma xprs_aaa: ∀h,g,L,T,A. L ⊢ T ⁝ A → ∀U. ⦃h, L⦄ ⊢ T •➡*[g] U → L ⊢ U ⁝ A.
  23 #h #g #L #T #A #HT #U #H @(xprs_ind … H) -U // /2 width=5/
  24 qed.