src/CTT/bool.thy
author clasohm
Thu Sep 16 12:20:38 1993 +0200 (1993-09-16)
changeset 0 a5a9c433f639
permissions -rw-r--r--
Initial revision
clasohm@0
     1
(*  Title: 	CTT/bool
clasohm@0
     2
    ID:         $Id$
clasohm@0
     3
    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
clasohm@0
     4
    Copyright   1991  University of Cambridge
clasohm@0
     5
clasohm@0
     6
The two-element type (booleans and conditionals)
clasohm@0
     7
*)
clasohm@0
     8
clasohm@0
     9
Bool = CTT +
clasohm@0
    10
clasohm@0
    11
consts Bool		:: "t"
clasohm@0
    12
       true,false	:: "i"
clasohm@0
    13
       cond		:: "[i,i,i]=>i"
clasohm@0
    14
rules
clasohm@0
    15
  Bool_def	"Bool == T+T"
clasohm@0
    16
  true_def	"true == inl(tt)"
clasohm@0
    17
  false_def	"false == inr(tt)"
clasohm@0
    18
  cond_def	"cond(a,b,c) == when(a, %u.b, %u.c)"
clasohm@0
    19
end