src/HOL/Lex/Automata.thy

Added an exception handler and error msg.

(*  Title:      HOL/Lex/Automata.thy
    ID:         $Id$
    Author:     Tobias Nipkow
    Copyright   1998 TUM

Conversions between different kinds of automata
*)

Automata = DA + NAe +

constdefs
 na2da :: ('a,'s)na => ('a,'s set)da
"na2da A == ({start A}, %a Q. Union(next A a ` Q), %Q. ? q:Q. fin A q)"

 nae2da :: ('a,'s)nae => ('a,'s set)da
"nae2da A == ({start A},
              %a Q. Union(next A (Some a) ` ((eps A)^* `` Q)),
              %Q. ? p: (eps A)^* `` Q. fin A p)"

end