src/HOLCF/Sprod3.ML

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(*  Title:      HOLCF/sprod3.thy
    ID:         $Id$
    Author:     Franz Regensburger
    Copyright   1993 Technische Universitaet Muenchen

Lemmas for Sprod3.thy 
*)

open Sprod3;

(* ------------------------------------------------------------------------ *)
(* continuity of Ispair, Isfst, Issnd                                       *)
(* ------------------------------------------------------------------------ *)

qed_goal "sprod3_lemma1" Sprod3.thy 
"[| is_chain(Y);  x~= UU;  lub(range(Y))~= UU |] ==>\
\ Ispair (lub(range Y)) x =\
\ Ispair (lub(range(%i. Isfst(Ispair(Y i) x)))) \
\        (lub(range(%i. Issnd(Ispair(Y i) x))))"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (res_inst_tac [("f1","Ispair")] (arg_cong RS cong) 1),
        (rtac lub_equal 1),
        (atac 1),
        (rtac (monofun_Isfst RS ch2ch_monofun) 1),
        (rtac ch2ch_fun 1),
        (rtac (monofun_Ispair1 RS ch2ch_monofun) 1),
        (atac 1),
        (rtac allI 1),
        (asm_simp_tac Sprod0_ss 1),
        (rtac sym 1),
        (rtac lub_chain_maxelem 1),
        (res_inst_tac [("P","%j.~Y(j)=UU")] exE 1),
        (rtac (notall2ex RS iffD1) 1),
        (res_inst_tac [("Q","lub(range(Y)) = UU")] contrapos 1),
        (atac 1),
        (rtac chain_UU_I_inverse 1),
        (atac 1),
        (rtac exI 1),
        (etac Issnd2 1),
        (rtac allI 1),
        (res_inst_tac [("Q","Y(i)=UU")] (excluded_middle RS disjE) 1),
        (asm_simp_tac Sprod0_ss 1),
        (rtac refl_less 1),
        (res_inst_tac [("s","UU"),("t","Y(i)")] subst 1),
        (etac sym 1),
        (asm_simp_tac Sprod0_ss  1),
        (rtac minimal 1)
        ]);

qed_goal "sprod3_lemma2" Sprod3.thy 
"[| is_chain(Y); x ~= UU; lub(range(Y)) = UU |] ==>\
\   Ispair (lub(range Y)) x =\
\   Ispair (lub(range(%i. Isfst(Ispair(Y i) x))))\
\          (lub(range(%i. Issnd(Ispair(Y i) x))))"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (res_inst_tac [("s","UU"),("t","lub(range(Y))")] ssubst 1),
        (atac 1),
        (rtac trans 1),
        (rtac strict_Ispair1 1),
        (rtac (strict_Ispair RS sym) 1),
        (rtac disjI1 1),
        (rtac chain_UU_I_inverse 1),
        (rtac allI 1),
        (asm_simp_tac Sprod0_ss  1),
        (etac (chain_UU_I RS spec) 1),
        (atac 1)
        ]);


qed_goal "sprod3_lemma3" Sprod3.thy 
"[| is_chain(Y); x = UU |] ==>\
\          Ispair (lub(range Y)) x =\
\          Ispair (lub(range(%i. Isfst(Ispair (Y i) x))))\
\                 (lub(range(%i. Issnd(Ispair (Y i) x))))"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (res_inst_tac [("s","UU"),("t","x")] ssubst 1),
        (atac 1),
        (rtac trans 1),
        (rtac strict_Ispair2 1),
        (rtac (strict_Ispair RS sym) 1),
        (rtac disjI1 1),
        (rtac chain_UU_I_inverse 1),
        (rtac allI 1),
        (simp_tac Sprod0_ss  1)
        ]);


qed_goal "contlub_Ispair1" Sprod3.thy "contlub(Ispair)"
(fn prems =>
        [
        (rtac contlubI 1),
        (strip_tac 1),
        (rtac (expand_fun_eq RS iffD2) 1),
        (strip_tac 1),
        (rtac (lub_fun RS thelubI RS ssubst) 1),
        (etac (monofun_Ispair1 RS ch2ch_monofun) 1),
        (rtac trans 1),
        (rtac (thelub_sprod RS sym) 2),
        (rtac ch2ch_fun 2),
        (etac (monofun_Ispair1 RS ch2ch_monofun) 2),
        (res_inst_tac [("Q","x=UU")] (excluded_middle RS disjE) 1),
        (res_inst_tac 
                [("Q","lub(range(Y))=UU")] (excluded_middle RS disjE) 1),
        (etac sprod3_lemma1 1),
        (atac 1),
        (atac 1),
        (etac sprod3_lemma2 1),
        (atac 1),
        (atac 1),
        (etac sprod3_lemma3 1),
        (atac 1)
        ]);

qed_goal "sprod3_lemma4" Sprod3.thy 
"[| is_chain(Y); x ~= UU; lub(range(Y)) ~= UU |] ==>\
\         Ispair x (lub(range Y)) =\
\         Ispair (lub(range(%i. Isfst (Ispair x (Y i)))))\
\                (lub(range(%i. Issnd (Ispair x (Y i)))))"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (res_inst_tac [("f1","Ispair")] (arg_cong RS cong) 1),
        (rtac sym 1),
        (rtac lub_chain_maxelem 1),
        (res_inst_tac [("P","%j.Y(j)~=UU")] exE 1),
        (rtac (notall2ex RS iffD1) 1),
        (res_inst_tac [("Q","lub(range(Y)) = UU")] contrapos 1),
        (atac 1),
        (rtac chain_UU_I_inverse 1),
        (atac 1),
        (rtac exI 1),
        (etac Isfst2 1),
        (rtac allI 1),
        (res_inst_tac [("Q","Y(i)=UU")] (excluded_middle RS disjE) 1),
        (asm_simp_tac Sprod0_ss 1),
        (rtac refl_less 1),
        (res_inst_tac [("s","UU"),("t","Y(i)")] subst 1),
        (etac sym 1),
        (asm_simp_tac Sprod0_ss  1),
        (rtac minimal 1),
        (rtac lub_equal 1),
        (atac 1),
        (rtac (monofun_Issnd RS ch2ch_monofun) 1),
        (rtac (monofun_Ispair2 RS ch2ch_monofun) 1),
        (atac 1),
        (rtac allI 1),
        (asm_simp_tac Sprod0_ss 1)
        ]);

qed_goal "sprod3_lemma5" Sprod3.thy 
"[| is_chain(Y); x ~= UU; lub(range(Y)) = UU |] ==>\
\         Ispair x (lub(range Y)) =\
\         Ispair (lub(range(%i. Isfst(Ispair x (Y i)))))\
\                (lub(range(%i. Issnd(Ispair x (Y i)))))"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (res_inst_tac [("s","UU"),("t","lub(range(Y))")] ssubst 1),
        (atac 1),
        (rtac trans 1),
        (rtac strict_Ispair2 1),
        (rtac (strict_Ispair RS sym) 1),
        (rtac disjI2 1),
        (rtac chain_UU_I_inverse 1),
        (rtac allI 1),
        (asm_simp_tac Sprod0_ss  1),
        (etac (chain_UU_I RS spec) 1),
        (atac 1)
        ]);

qed_goal "sprod3_lemma6" Sprod3.thy 
"[| is_chain(Y); x = UU |] ==>\
\         Ispair x (lub(range Y)) =\
\         Ispair (lub(range(%i. Isfst (Ispair x (Y i)))))\
\                (lub(range(%i. Issnd (Ispair x (Y i)))))"
(fn prems =>
        [
        (cut_facts_tac prems 1),
        (res_inst_tac [("s","UU"),("t","x")] ssubst 1),
        (atac 1),
        (rtac trans 1),
        (rtac strict_Ispair1 1),
        (rtac (strict_Ispair RS sym) 1),
        (rtac disjI1 1),
        (rtac chain_UU_I_inverse 1),
        (rtac allI 1),
        (simp_tac Sprod0_ss  1)
        ]);

qed_goal "contlub_Ispair2" Sprod3.thy "contlub(Ispair(x))"
(fn prems =>
        [
        (rtac contlubI 1),
        (strip_tac 1),
        (rtac trans 1),
        (rtac (thelub_sprod RS sym) 2),
        (etac (monofun_Ispair2 RS ch2ch_monofun) 2),
        (res_inst_tac [("Q","x=UU")] (excluded_middle RS disjE) 1),
        (res_inst_tac [("Q","lub(range(Y))=UU")] 
                (excluded_middle RS disjE) 1),
        (etac sprod3_lemma4 1),
        (atac 1),
        (atac 1),
        (etac sprod3_lemma5 1),
        (atac 1),
        (atac 1),
        (etac sprod3_lemma6 1),
        (atac 1)
        ]);


qed_goal "cont_Ispair1" Sprod3.thy "cont(Ispair)"
(fn prems =>
        [
        (rtac monocontlub2cont 1),
        (rtac monofun_Ispair1 1),
        (rtac contlub_Ispair1 1)
        ]);


qed_goal "cont_Ispair2" Sprod3.thy "cont(Ispair(x))"
(fn prems =>
        [
        (rtac monocontlub2cont 1),
        (rtac monofun_Ispair2 1),
        (rtac contlub_Ispair2 1)
        ]);

qed_goal "contlub_Isfst" Sprod3.thy "contlub(Isfst)"
 (fn prems =>
        [
        (rtac contlubI 1),
        (strip_tac 1),
        (rtac (lub_sprod RS thelubI RS ssubst) 1),
        (atac 1),
        (res_inst_tac [("Q","lub(range(%i. Issnd(Y(i))))=UU")]  
                (excluded_middle RS disjE) 1),
        (asm_simp_tac Sprod0_ss  1),
        (res_inst_tac [("s","UU"),("t","lub(range(%i. Issnd(Y(i))))")]
                ssubst 1),
        (atac 1),
        (rtac trans 1),
        (asm_simp_tac Sprod0_ss  1),
        (rtac sym 1),
        (rtac chain_UU_I_inverse 1),
        (rtac allI 1),
        (rtac strict_Isfst 1),
        (rtac swap 1),
        (etac (defined_IsfstIssnd RS conjunct2) 2),
        (rtac notnotI 1),
        (rtac (chain_UU_I RS spec) 1),
        (rtac (monofun_Issnd RS ch2ch_monofun) 1),
        (atac 1),
        (atac 1)
        ]);


qed_goal "contlub_Issnd" Sprod3.thy "contlub(Issnd)"
(fn prems =>
        [
        (rtac contlubI 1),
        (strip_tac 1),
        (rtac (lub_sprod RS thelubI RS ssubst) 1),
        (atac 1),
        (res_inst_tac [("Q","lub(range(%i. Isfst(Y(i))))=UU")]
         (excluded_middle RS disjE) 1),
        (asm_simp_tac Sprod0_ss  1),
        (res_inst_tac [("s","UU"),("t","lub(range(%i. Isfst(Y(i))))")] 
                ssubst 1),
        (atac 1),
        (asm_simp_tac Sprod0_ss  1),
        (rtac sym 1),
        (rtac chain_UU_I_inverse 1),
        (rtac allI 1),
        (rtac strict_Issnd 1),
        (rtac swap 1),
        (etac (defined_IsfstIssnd RS conjunct1) 2),
        (rtac notnotI 1),
        (rtac (chain_UU_I RS spec) 1),
        (rtac (monofun_Isfst RS ch2ch_monofun) 1),
        (atac 1),
        (atac 1)
        ]);


qed_goal "cont_Isfst" Sprod3.thy "cont(Isfst)"
(fn prems =>
        [
        (rtac monocontlub2cont 1),
        (rtac monofun_Isfst 1),
        (rtac contlub_Isfst 1)
        ]);

qed_goal "cont_Issnd" Sprod3.thy "cont(Issnd)"
(fn prems =>
        [
        (rtac monocontlub2cont 1),
        (rtac monofun_Issnd 1),
        (rtac contlub_Issnd 1)
        ]);

(* 
 -------------------------------------------------------------------------- 
 more lemmas for Sprod3.thy 
 
 -------------------------------------------------------------------------- 
*)

qed_goal "spair_eq" Sprod3.thy "[|x1=x2;y1=y2|] ==> (|x1,y1|) = (|x2,y2|)"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (fast_tac HOL_cs 1)
        ]);

(* ------------------------------------------------------------------------ *)
(* convert all lemmas to the continuous versions                            *)
(* ------------------------------------------------------------------------ *)

qed_goalw "beta_cfun_sprod" Sprod3.thy [spair_def]
        "(LAM x y.Ispair x y)`a`b = Ispair a b"
 (fn prems =>
        [
        (rtac (beta_cfun RS ssubst) 1),
        (cont_tac 1),
        (rtac cont_Ispair2 1),
        (rtac cont2cont_CF1L 1),
        (rtac cont_Ispair1 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Ispair2 1),
        (rtac refl 1)
        ]);

qed_goalw "inject_spair" Sprod3.thy [spair_def]
        "[| aa~=UU ; ba~=UU ; (|a,b|)=(|aa,ba|) |] ==> a=aa & b=ba"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (etac inject_Ispair 1),
        (atac 1),
        (etac box_equals 1),
        (rtac beta_cfun_sprod 1),
        (rtac beta_cfun_sprod 1)
        ]);

qed_goalw "inst_sprod_pcpo2" Sprod3.thy [spair_def] "UU = (|UU,UU|)"
 (fn prems =>
        [
        (rtac sym 1),
        (rtac trans 1),
        (rtac beta_cfun_sprod 1),
        (rtac sym 1),
        (rtac inst_sprod_pcpo 1)
        ]);

qed_goalw "strict_spair" Sprod3.thy [spair_def] 
        "(a=UU | b=UU) ==> (|a,b|)=UU"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac trans 1),
        (rtac beta_cfun_sprod 1),
        (rtac trans 1),
        (rtac (inst_sprod_pcpo RS sym) 2),
        (etac strict_Ispair 1)
        ]);

qed_goalw "strict_spair1" Sprod3.thy [spair_def] "(|UU,b|) = UU"
 (fn prems =>
        [
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac trans 1),
        (rtac (inst_sprod_pcpo RS sym) 2),
        (rtac strict_Ispair1 1)
        ]);

qed_goalw "strict_spair2" Sprod3.thy [spair_def] "(|a,UU|) = UU"
 (fn prems =>
        [
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac trans 1),
        (rtac (inst_sprod_pcpo RS sym) 2),
        (rtac strict_Ispair2 1)
        ]);

qed_goalw "strict_spair_rev" Sprod3.thy [spair_def]
        "(|x,y|)~=UU ==> ~x=UU & ~y=UU"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac strict_Ispair_rev 1),
        (rtac (beta_cfun_sprod RS subst) 1),
        (rtac (inst_sprod_pcpo RS subst) 1),
        (atac 1)
        ]);

qed_goalw "defined_spair_rev" Sprod3.thy [spair_def]
 "(|a,b|) = UU ==> (a = UU | b = UU)"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac defined_Ispair_rev 1),
        (rtac (beta_cfun_sprod RS subst) 1),
        (rtac (inst_sprod_pcpo RS subst) 1),
        (atac 1)
        ]);

qed_goalw "defined_spair" Sprod3.thy [spair_def]
        "[|a~=UU; b~=UU|] ==> (|a,b|) ~= UU"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (inst_sprod_pcpo RS ssubst) 1),
        (etac defined_Ispair 1),
        (atac 1)
        ]);

qed_goalw "Exh_Sprod2" Sprod3.thy [spair_def]
        "z=UU | (? a b. z=(|a,b|) & a~=UU & b~=UU)"
 (fn prems =>
        [
        (rtac (Exh_Sprod RS disjE) 1),
        (rtac disjI1 1),
        (rtac (inst_sprod_pcpo RS ssubst) 1),
        (atac 1),
        (rtac disjI2 1),
        (etac exE 1),
        (etac exE 1),
        (rtac exI 1),
        (rtac exI 1),
        (rtac conjI 1),
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (fast_tac HOL_cs 1),
        (fast_tac HOL_cs 1)
        ]);


qed_goalw "sprodE" Sprod3.thy [spair_def]
"[|p=UU ==> Q;!!x y. [|p=(|x,y|);x~=UU ; y~=UU|] ==> Q|] ==> Q"
(fn prems =>
        [
        (rtac IsprodE 1),
        (resolve_tac prems 1),
        (rtac (inst_sprod_pcpo RS ssubst) 1),
        (atac 1),
        (resolve_tac prems 1),
        (atac 2),
        (atac 2),
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (atac 1)
        ]);


qed_goalw "strict_sfst" Sprod3.thy [sfst_def] 
        "p=UU==>sfst`p=UU"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac strict_Isfst 1),
        (rtac (inst_sprod_pcpo RS subst) 1),
        (atac 1)
        ]);

qed_goalw "strict_sfst1" Sprod3.thy [sfst_def,spair_def] 
        "sfst`(|UU,y|) = UU"
 (fn prems =>
        [
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac strict_Isfst1 1)
        ]);
 
qed_goalw "strict_sfst2" Sprod3.thy [sfst_def,spair_def] 
        "sfst`(|x,UU|) = UU"
 (fn prems =>
        [
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac strict_Isfst2 1)
        ]);

qed_goalw "strict_ssnd" Sprod3.thy [ssnd_def] 
        "p=UU==>ssnd`p=UU"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac strict_Issnd 1),
        (rtac (inst_sprod_pcpo RS subst) 1),
        (atac 1)
        ]);

qed_goalw "strict_ssnd1" Sprod3.thy [ssnd_def,spair_def] 
        "ssnd`(|UU,y|) = UU"
 (fn prems =>
        [
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac strict_Issnd1 1)
        ]);

qed_goalw "strict_ssnd2" Sprod3.thy [ssnd_def,spair_def] 
        "ssnd`(|x,UU|) = UU"
 (fn prems =>
        [
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac strict_Issnd2 1)
        ]);

qed_goalw "sfst2" Sprod3.thy [sfst_def,spair_def] 
        "y~=UU ==>sfst`(|x,y|)=x"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (etac Isfst2 1)
        ]);

qed_goalw "ssnd2" Sprod3.thy [ssnd_def,spair_def] 
        "x~=UU ==>ssnd`(|x,y|)=y"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (etac Issnd2 1)
        ]);


qed_goalw "defined_sfstssnd" Sprod3.thy [sfst_def,ssnd_def,spair_def]
        "p~=UU ==> sfst`p ~=UU & ssnd`p ~=UU"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac defined_IsfstIssnd 1),
        (rtac (inst_sprod_pcpo RS subst) 1),
        (atac 1)
        ]);
 

qed_goalw "surjective_pairing_Sprod2" Sprod3.thy 
        [sfst_def,ssnd_def,spair_def] "(|sfst`p , ssnd`p|) = p"
 (fn prems =>
        [
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac (surjective_pairing_Sprod RS sym) 1)
        ]);


qed_goalw "less_sprod5b" Sprod3.thy [sfst_def,ssnd_def,spair_def]
 "p1~=UU ==> (p1<<p2) = (sfst`p1<<sfst`p2 & ssnd`p1<<ssnd`p2)"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac (beta_cfun RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac less_sprod3b 1),
        (rtac (inst_sprod_pcpo RS subst) 1),
        (atac 1)
        ]);

 
qed_goalw "less_sprod5c" Sprod3.thy [sfst_def,ssnd_def,spair_def]
 "[|(|xa,ya|) << (|x,y|);xa~=UU;ya~=UU;x~=UU;y~=UU|] ==>xa<<x & ya << y"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac less_sprod4c 1),
        (REPEAT (atac 2)),
        (rtac (beta_cfun_sprod RS subst) 1),
        (rtac (beta_cfun_sprod RS subst) 1),
        (atac 1)
        ]);

qed_goalw "lub_sprod2" Sprod3.thy [sfst_def,ssnd_def,spair_def]
"[|is_chain(S)|] ==> range(S) <<| \
\ (| lub(range(%i.sfst`(S i))), lub(range(%i.ssnd`(S i))) |)"
 (fn prems =>
        [
        (cut_facts_tac prems 1),
        (rtac (beta_cfun_sprod RS ssubst) 1),
        (rtac (beta_cfun RS ext RS ssubst) 1),
        (rtac cont_Issnd 1),
        (rtac (beta_cfun RS ext RS ssubst) 1),
        (rtac cont_Isfst 1),
        (rtac lub_sprod 1),
        (resolve_tac prems 1)
        ]);


val thelub_sprod2 = (lub_sprod2 RS thelubI);
(*
 "is_chain ?S1 ==>
 lub (range ?S1) =
 (|lub (range (%i. sfst`(?S1 i))), lub (range (%i. ssnd`(?S1 i)))|)" : thm
*)

qed_goalw "ssplit1" Sprod3.thy [ssplit_def]
        "ssplit`f`UU=UU"
 (fn prems =>
        [
        (rtac (beta_cfun RS ssubst) 1),
        (cont_tacR 1),
        (rtac (strictify1 RS ssubst) 1),
        (rtac refl 1)
        ]);

qed_goalw "ssplit2" Sprod3.thy [ssplit_def]
        "[|x~=UU;y~=UU|] ==> ssplit`f`(|x,y|)= f`x`y"
 (fn prems =>
        [
        (rtac (beta_cfun RS ssubst) 1),
        (cont_tacR 1),
        (rtac (strictify2 RS ssubst) 1),
        (rtac defined_spair 1),
        (resolve_tac prems 1),
        (resolve_tac prems 1),
        (rtac (beta_cfun RS ssubst) 1),
        (cont_tacR 1),
        (rtac (sfst2 RS ssubst) 1),
        (resolve_tac prems 1),
        (rtac (ssnd2 RS ssubst) 1),
        (resolve_tac prems 1),
        (rtac refl 1)
        ]);


qed_goalw "ssplit3" Sprod3.thy [ssplit_def]
  "ssplit`spair`z=z"
 (fn prems =>
        [
        (rtac (beta_cfun RS ssubst) 1),
        (cont_tacR 1),
        (res_inst_tac [("Q","z=UU")] classical2 1),
        (hyp_subst_tac 1),
        (rtac strictify1 1),
        (rtac trans 1),
        (rtac strictify2 1),
        (atac 1),
        (rtac (beta_cfun RS ssubst) 1),
        (cont_tacR 1),
        (rtac surjective_pairing_Sprod2 1)
        ]);


(* ------------------------------------------------------------------------ *)
(* install simplifier for Sprod                                             *)
(* ------------------------------------------------------------------------ *)

val Sprod_rews = [strict_spair1,strict_spair2,strict_sfst1,strict_sfst2,
                strict_ssnd1,strict_ssnd2,sfst2,ssnd2,defined_spair,
                ssplit1,ssplit2];

Addsimps [strict_spair1,strict_spair2,strict_sfst1,strict_sfst2,
          strict_ssnd1,strict_ssnd2,sfst2,ssnd2,defined_spair,
          ssplit1,ssplit2];