(* Contribution to the Coq Library   V6.3 (July 1999)                    *)
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(* This contribution was updated for Coq V5.10 by the COQ workgroup.        *)
(* January 1995                                                             *)
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(*      Coq V5.8                                                            *)
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(*      Alternating Bit Protocol                                            *)
(*                                                                          *)
(*      Jan Friso Groote                                                    *)
(*      Utrecht University                                                  *)
(*                                                                          *)
(*      November 1992                                                       *)
(*                                                                          *)
(* From bezem@phil.ruu.nl Fri Apr  2 13:14:31 1993                          *)
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(*                               abp_lem25.v                                *)
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intros.
elim EXPH4.
elim Lmers6.
elim LmerK.
elim LmerTnd.
pattern (R i) at 1 3 4 5 in |- *.
elim ProcR.
elim LmerRn.
elim CommTn_dK.
elim (SC3 (seq (Rn e1) (seq (Rn e0) (R i))) (K i)).
elim CommKRn.
elim
(SC3 (seq (Rn e1) (seq (Rn e0) (R i))) (seq (Tn_d d e0) (seq (Sn e1) (S i)))).
elim CommTn_dRn.
elim CommKs6.
elim CommRns6.
pattern e1 at 1 2 in |- *.
elimtype (toggle e0 = e1).
elim CommTn_ds6_b.
repeat elim A6.
repeat elim A6'.
unfold X1 in |- *.
elim
(SC6 (mer (seq (Sn_d d e0) (seq (Sn e1) (S i))) (mer (R i) (K i))) (L i)).
elim SC7.
elim SC7.
elim (SC6 (mer (K i) (L i)) (R i)).
elim SC7.
apply refl_equal.
elim Toggle1.
apply refl_equal.
Qed.
intros.
elim EXPH4.
elim Lmers6.
elim LmerK.
elim LmerTnd.
pattern (R i) at 1 3 4 5 in |- *.
elim ProcR.
elim LmerRn.
elim CommTn_dK.
elim (SC3 (seq (Rn e1) (seq (Rn e0) (R i))) (K i)).
elim CommKRn.
elim
(SC3 (seq (Rn e1) (seq (Rn e0) (R i))) (seq (Tn_d d e0) (seq (Sn e1) (S i)))).
elim CommTn_dRn.
elim CommKs6.
elim CommRns6.
elim CommTn_ds6_sce.
repeat elim A6.
repeat elim A6'.
unfold X1 in |- *.
elim
(SC6 (mer (seq (Sn_d d e0) (seq (Sn e1) (S i))) (mer (R i) (K i))) (L i)).
elim SC7.
elim SC7.
elimtype (mer (K i) (mer (L i) (R i)) = mer (R i) (mer (K i) (L i))).
apply refl_equal.
elim (SC6 (mer (K i) (L i)) (R i)).
elim SC7.
apply refl_equal.
Qed.
intros.
pattern (X1 d) at 2 in |- *.
elim Lem3.
elim Lem4.
elim Lem5.
elim Lem6.
elim Lem7.
elim Lem8.
elim Lem9.
elim Lem10.
elim Lem11.
elim A4.
elim A5.
elim A5.
apply refl_equal.
Qed.
intro.
unfold Y1 at 1 in |- *.
elim (EXPH4 (seq (Sn_d d e1) (S i))).
elim LmerSnd.
elim LmerK.
elim LmerL.
pattern (R i) at 2 3 5 8 in |- *.
elim ProcR.
elim LmerRn.
elim CommLRn.
elim CommKL.
elim CommKRn.
elim ProcSn_d.
elim A5.
elim Comms2K.
elim Comms2Rn.
elim Comms2L.
repeat elim A6.
repeat elim A6'.
elim SC7.
apply refl_equal.
Qed.
intros.
elim (EXPH4 (seq (Tn_d d e1) (S i))).
elim LmerTnd.
elim LmerL.
elim A4.
elim A5.
elim A5.
elim Lmeri.
elim LmerRn.
elim CommLRn.
elim CommiL.
elim CommiRn.
elim CommTn_dL.
elim CommTn_di.
elim CommTn_dRn.
repeat elim A6.
repeat elim A6'.
apply refl_equal.
Qed.
intros.
elim (EXPH4 (seq (ia Frame s3 lce) (K i))).
elim Lmers3.
elim LmerTnd.
elim LmerL.
elim LmerRn.
elim CommLRn.
elim CommTn_dL.
elim CommTn_dRn.
elim Comms3Tn_d.
elim Comms3L.
elim Comms3Rn_lce.
repeat elim A6'.
repeat elim A6.
elim SC7.
elim A5.
apply refl_equal.
Qed.
intros.
elim (EXPH4 (seq (ia Frame s3 (Tuple e1 d)) (K i))).
elim Lmers3.
elim LmerTnd.
elim LmerL.
elim LmerRn.
elim CommLRn.
elim CommTn_dL.
elim CommTn_dRn.
elim Comms3Tn_d.
elim Comms3L.
pattern e1 at 4 in |- *.
elimtype (toggle e0 = e1).
elim Comms3Rn_b.
repeat elim A6'.
elim Toggle1.
apply refl_equal.
elim Toggle1.
apply refl_equal.
Qed.
intros.
elim EXPH4.
elim LmerK.
elim Lmers4.
elim LmerTnd.
elim LmerL.
elim CommTn_dL.
elim CommTn_ds4.
elim CommLs4.
elim CommKs4.
elim (SC3 (seq (Tn_d d e1) (S i)) (K i)).
elim CommTn_dK.
elim CommKL.
repeat elim A6.
repeat elim A6'.
unfold Y2 in |- *.
elim (SC6 (seq (ia frame s5 (tuple e1)) (R i)) (L i)).
elim (SC6 (mer (seq (ia frame s5 (tuple e1)) (R i)) (L i)) (K i)).
elim
(SC6 (mer (mer (seq (ia frame s5 (tuple e1)) (R i)) (L i)) (K i))
(seq (Tn_d d e1) (S i))).
elim SC7.
elim SC7.
elim (SC6 (mer (K i) (seq (Tn_d d e1) (S i))) (L i)).
elim SC7.
apply refl_equal.
Qed.

Theorem Lem18 :
forall d : D,
seq (ia frame c5 (tuple e0))
(enc H
(mer (seq (Rn e0) (R i))
(mer
(alt (seq (ia one int i) (seq (ia frame s6 (tuple e0)) (L i)))
(seq (ia one int i) (seq (ia frame s6 sce) (L i))))
(mer (K i) (seq (Tn_d d e1) (S i)))))) =
enc H
(mer (K i)
(mer (seq (ia frame s5 (tuple e0)) (seq (Rn e0) (R i)))
(mer (seq (Tn_d d e1) (S i)) (L i)))).