src/FOLP/ex/Prolog.thy
author wenzelm
Sat Jul 25 10:31:27 2009 +0200 (2009-07-25)
changeset 32187 cca43ca13f4f
parent 1477 4c51ab632cda
child 35762 af3ff2ba4c54
permissions -rw-r--r--
renamed structure Display_Goal to Goal_Display;
     1 (*  Title:      FOLP/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   'a list
    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