src/ZF/Finite.thy
changeset 516 1957113f0d7d
child 534 cd8bec47e175
     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/ZF/Finite.thy	Fri Aug 12 12:51:34 1994 +0200
     1.3 @@ -0,0 +1,18 @@
     1.4 +(*  Title: 	ZF/Finite.thy
     1.5 +    ID:         $Id$
     1.6 +    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
     1.7 +    Copyright   1994  University of Cambridge
     1.8 +
     1.9 +Finite powerset operator
    1.10 +*)
    1.11 +
    1.12 +Finite = Arith + 
    1.13 +consts Fin :: "i=>i"
    1.14 +inductive
    1.15 +  domains   "Fin(A)" <= "Pow(A)"
    1.16 +  intrs
    1.17 +    emptyI  "0 : Fin(A)"
    1.18 +    consI   "[| a: A;  b: Fin(A) |] ==> cons(a,b) : Fin(A)"
    1.19 +  type_intrs "[empty_subsetI, cons_subsetI, PowI]"
    1.20 +  type_elims "[make_elim PowD]"
    1.21 +end