(* *)
(**************************************************************************)
+include "ground_2/ynat/ynat_minus_sn.ma".
include "basic_2A/notation/relations/cosn_5.ma".
include "basic_2A/computation/lsx.ma".
| lcosx_sort: ∀l. lcosx h g G l (⋆)
| lcosx_skip: ∀I,L,T. lcosx h g G 0 L → lcosx h g G 0 (L.ⓑ{I}T)
| lcosx_pair: ∀I,L,T,l. G ⊢ ⬊*[h, g, T, l] L →
- lcosx h g G l L â\86\92 lcosx h g G (⫯l) (L.ⓑ{I}T)
+ lcosx h g G l L â\86\92 lcosx h g G (â\86\91l) (L.ⓑ{I}T)
.
interpretation
lemma lcosx_drop_trans_lt: ∀h,g,G,L,l. G ⊢ ~⬊*[h, g, l] L →
∀I,K,V,i. ⬇[i] L ≡ K.ⓑ{I}V → i < l →
- G â\8a¢ ~â¬\8a*[h, g, â«°(l-i)] K â\88§ G â\8a¢ â¬\8a*[h, g, V, â«°(l-i)] K.
+ G â\8a¢ ~â¬\8a*[h, g, â\86\93(l-i)] K â\88§ G â\8a¢ â¬\8a*[h, g, V, â\86\93(l-i)] K.
#h #g #G #L #l #H elim H -L -l
[ #l #J #K #V #i #H elim (drop_inv_atom1 … H) -H #H destruct
| #I #L #T #_ #_ #J #K #V #i #_ #H elim (ylt_yle_false … H) -H //
elim (drop_inv_O1_pair1 … H) -H * #Hi #HLK destruct
[ >ypred_succ /2 width=1 by conj/
| lapply (ylt_pred … Hil ?) -Hil /2 width=1 by ylt_inj/ >ypred_succ #Hil
- elim (IHL … HLK ?) -IHL -HLK <yminus_inj >yminus_SO2 //
+ elim (IHL … HLK ?) -IHL -HLK >minus_SO_dx //
<(ypred_succ l) in ⊢ (%→%→?); >yminus_pred /2 width=1 by ylt_inj, conj/
]
]
(* Basic inversion lemmas ***************************************************)
-fact lcosx_inv_succ_aux: â\88\80h,g,G,L,x. G â\8a¢ ~â¬\8a*[h, g, x] L â\86\92 â\88\80l. x = ⫯l →
+fact lcosx_inv_succ_aux: â\88\80h,g,G,L,x. G â\8a¢ ~â¬\8a*[h, g, x] L â\86\92 â\88\80l. x = â\86\91l →
L = ⋆ ∨
∃∃I,K,V. L = K.ⓑ{I}V & G ⊢ ~⬊*[h, g, l] K &
G ⊢ ⬊*[h, g, V, l] K.
#h #g #G #L #l * -L -l /2 width=1 by or_introl/
[ #I #L #T #_ #x #H elim (ysucc_inv_O_sn … H)
-| #I #L #T #l #HT #HL #x #H <(ysucc_inj … H) -x
+| #I #L #T #l #HT #HL #x #H <(ysucc_inv_inj … H) -x
/3 width=6 by ex3_3_intro, or_intror/
]
qed-.
-lemma lcosx_inv_succ: â\88\80h,g,G,L,l. G â\8a¢ ~â¬\8a*[h, g, ⫯l] L → L = ⋆ ∨
+lemma lcosx_inv_succ: â\88\80h,g,G,L,l. G â\8a¢ ~â¬\8a*[h, g, â\86\91l] L → L = ⋆ ∨
∃∃I,K,V. L = K.ⓑ{I}V & G ⊢ ~⬊*[h, g, l] K &
G ⊢ ⬊*[h, g, V, l] K.
/2 width=3 by lcosx_inv_succ_aux/ qed-.
-lemma lcosx_inv_pair: â\88\80h,g,I,G,L,T,l. G â\8a¢ ~â¬\8a*[h, g, ⫯l] L.ⓑ{I}T →
+lemma lcosx_inv_pair: â\88\80h,g,I,G,L,T,l. G â\8a¢ ~â¬\8a*[h, g, â\86\91l] L.ⓑ{I}T →
G ⊢ ~⬊*[h, g, l] L ∧ G ⊢ ⬊*[h, g, T, l] L.
#h #g #I #G #L #T #l #H elim (lcosx_inv_succ … H) -H
[ #H destruct