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ex/PL0.thy
author wenzelm
Wed, 14 Sep 1994 16:05:28 +0200
changeset 142 760641387b20
parent 91 a94029edb01f
permissions -rw-r--r--
replaced lookup_const by Sign.const_type;

(*  Title: 	HOL/ex/pl0.thy
    ID:         $Id$
    Author: 	Tobias Nipkow
    Copyright   1994  TU Muenchen

Syntax of propositional logic formulae.
*)

PL0 = HOL +
datatype
    'a pl = false | var ('a) ("#_") | "->" ('a pl,'a pl) (infixr 90)
end
Old_HOL