src/CTT/Bool.thy
author clasohm
Thu Sep 16 12:20:38 1993 +0200 (1993-09-16)
changeset 0 a5a9c433f639
child 1474 3f7d67927fe2
permissions -rw-r--r--
Initial revision
     1 (*  Title: 	CTT/bool
     2     ID:         $Id$
     3     Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
     4     Copyright   1991  University of Cambridge
     5 
     6 The two-element type (booleans and conditionals)
     7 *)
     8 
     9 Bool = CTT +
    10 
    11 consts Bool		:: "t"
    12        true,false	:: "i"
    13        cond		:: "[i,i,i]=>i"
    14 rules
    15   Bool_def	"Bool == T+T"
    16   true_def	"true == inl(tt)"
    17   false_def	"false == inr(tt)"
    18   cond_def	"cond(a,b,c) == when(a, %u.b, %u.c)"
    19 end