src/CTT/Bool.thy

Initial revision

(*  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