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4 (* ||A|| A project by Andrea Asperti *)
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7 (* ||T|| The HELM team. *)
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15 include "basic_2/computation/fpns_fpns.ma".
16 include "basic_2/computation/fpbu_fpns.ma".
17 include "basic_2/computation/fpbc.ma".
19 (* SINGLE-STEP "BIG TREE" PROPER PARALLEL COMPUTATION FOR CLOSURES **********)
21 (* Properties on parallel computation for "big tree" normal forms ***********)
23 lemma fpbc_fpns_trans: ∀h,g,G1,G,G2,L1,L,L2,T1,T,T2. ⦃G1, L1, T1⦄ ≻⋕[h, g] ⦃G, L, T⦄ →
24 ⦃G, L, T⦄ ⊢ ⋕➡*[h, g] ⦃G2, L2, T2⦄ → ⦃G1, L1, T1⦄ ≻⋕[h, g] ⦃G2, L2, T2⦄.
25 #h #g #G1 #G #G2 #L1 #L #L2 #T1 #T #T2 *
26 /3 width=9 by fpns_trans, ex2_3_intro/
29 lemma fpns_fpbc_trans: ∀h,g,G1,G,G2,L1,L,L2,T1,T,T2. ⦃G1, L1, T1⦄ ⊢ ⋕➡*[h, g] ⦃G, L, T⦄ →
30 ⦃G, L, T⦄ ≻⋕[h, g] ⦃G2, L2, T2⦄ → ⦃G1, L1, T1⦄ ≻⋕[h, g] ⦃G2, L2, T2⦄.
31 #h #g #G1 #G #G2 #L1 #L #L2 #T1 #T #T2 #H1 *
32 #G0 #L0 #T0 #H0 #H02 elim (fpns_fpbu_trans … H1 … H0) -G -L -T
33 /3 width=9 by fpns_trans, ex2_3_intro/