src/CTT/Bool.thy
author obua
Fri, 16 Sep 2005 21:02:15 +0200
changeset 17440 df77edc4f5d0
parent 3837 d7f033c74b38
child 17441 5b5feca0344a
permissions -rw-r--r--
fixed HOL-light/Isabelle syntax incompatability via more protect_xxx functions

(*  Title:      CTT/bool
    ID:         $Id$
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1991  University of Cambridge

The two-element type (booleans and conditionals)
*)

Bool = CTT +

consts Bool             :: "t"
       true,false       :: "i"
       cond             :: "[i,i,i]=>i"
rules
  Bool_def      "Bool == T+T"
  true_def      "true == inl(tt)"
  false_def     "false == inr(tt)"
  cond_def      "cond(a,b,c) == when(a, %u. b, %u. c)"
end