matita/matita/contribs/lambdadelta/basic_2/rt_computation/fpbg_lfpxs.ma

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  14
  15 include "basic_2/computation/lpxs_ffdeq.ma".
  16 include "basic_2/computation/fpbg_ffdeq.ma".
  17
  18 (* PROPER PARALLEL RST-COMPUTATION FOR CLOSURES **************************)
  19
  20 lemma lpxs_fpbg: ∀h,o,G,L1,L2,T. ⦃G, L1⦄ ⊢ ➡*[h, o] L2 →
  21                  (L1 ≡[T, 0] L2 → ⊥) → ⦃G, L1, T⦄ >≛[h, o] ⦃G, L2, T⦄.
  22 #h #o #G #L1 #L2 #T #H #H0 elim (lpxs_nlleq_inv_step_sn … H … H0) -H -H0
  23 /4 width=5 by fpb_lpx, lpxs_lleq_fpbs, ex2_3_intro/
  24 qed.