simplify proof of the Bolzano bisection lemma; use more meta-logic to state it; renamed lemma_Bolzano to Bolzano
(* Title: HOL/MicroJava/DFA/Semilattices.thy
Author: Gerwin Klein
Copyright 2003 TUM
*)
header {* Semilattices *}
(*<*)
theory Semilattices
imports Err Opt Product Listn
begin
end
(*>*)