src/FOL/ex/Prolog.thy
author clasohm
Thu Sep 16 12:20:38 1993 +0200 (1993-09-16)
changeset 0 a5a9c433f639
child 352 fd3ab8bcb69d
permissions -rw-r--r--
Initial revision
     1 (*  Title: 	FOL/ex/prolog.thy
     2     ID:         $Id$
     3     Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
     4     Copyright   1992  University of Cambridge
     5 
     6 First-Order Logic: PROLOG examples
     7 
     8 Inherits from FOL the class term, the type o, and the coercion Trueprop
     9 *)
    10 
    11 Prolog = FOL +
    12 types   list 1
    13 arities list    :: (term)term
    14 consts  Nil     :: "'a list"
    15         ":"     :: "['a, 'a list]=> 'a list"            (infixr 60)
    16         app     :: "['a list, 'a list, 'a list] => o"
    17         rev     :: "['a list, 'a list] => o"
    18 rules   appNil  "app(Nil,ys,ys)"
    19         appCons "app(xs,ys,zs) ==> app(x:xs, ys, x:zs)"
    20         revNil  "rev(Nil,Nil)"
    21         revCons "[| rev(xs,ys);  app(ys, x:Nil, zs) |] ==> rev(x:xs, zs)"
    22 end