src/CTT/Bool.thy
author webertj
Sun, 14 Nov 2004 01:40:27 +0100
changeset 15283 f21466450330
parent 3837 d7f033c74b38
child 17441 5b5feca0344a
permissions -rw-r--r--
DOCTYPE declaration added
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
1474
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
     1
(*  Title:      CTT/bool
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     2
    ID:         $Id$
1474
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
     3
    Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     4
    Copyright   1991  University of Cambridge
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     5
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     6
The two-element type (booleans and conditionals)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     7
*)
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     8
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
     9
Bool = CTT +
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    10
1474
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
    11
consts Bool             :: "t"
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
    12
       true,false       :: "i"
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
    13
       cond             :: "[i,i,i]=>i"
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    14
rules
1474
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
    15
  Bool_def      "Bool == T+T"
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
    16
  true_def      "true == inl(tt)"
3f7d67927fe2 expanded tabs
clasohm
parents: 0
diff changeset
    17
  false_def     "false == inr(tt)"
3837
d7f033c74b38 fixed dots;
wenzelm
parents: 1474
diff changeset
    18
  cond_def      "cond(a,b,c) == when(a, %u. b, %u. c)"
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
    19
end