Deleted option_case_tac because exhaust_tac performs a similar function.
Deleted the duplicate proof of expand_option_case...
(* Title: HOL/Lex/Auto.ML
ID: $Id$
Author: Richard Mayr & Tobias Nipkow
Copyright 1995 TUM
*)
open Auto;
goalw Auto.thy [nexts_def] "nexts A st [] = st";
by(Simp_tac 1);
qed"nexts_Nil";
goalw Auto.thy [nexts_def] "nexts A st (x#xs) = nexts A (next A st x) xs";
by(Simp_tac 1);
qed"nexts_Cons";
Addsimps [nexts_Nil,nexts_Cons];
goalw Auto.thy [acc_prefix_def] "~acc_prefix A st []";
by(Simp_tac 1);
qed"acc_prefix_Nil";
Addsimps [acc_prefix_Nil];
goalw Auto.thy [acc_prefix_def]
"acc_prefix A s (x#xs) = (fin A (next A s x) | acc_prefix A (next A s x) xs)";
by(simp_tac (!simpset addsimps [prefix_Cons]) 1);
by(safe_tac (!claset));
by(Asm_full_simp_tac 1);
by (case_tac "zs=[]" 1);
by(hyp_subst_tac 1);
by(Asm_full_simp_tac 1);
by(Fast_tac 1);
by(res_inst_tac [("x","[x]")] exI 1);
by(asm_simp_tac (!simpset addsimps [eq_sym_conv]) 1);
by(res_inst_tac [("x","x#us")] exI 1);
by(Asm_simp_tac 1);
qed"acc_prefix_Cons";
Addsimps [acc_prefix_Cons];