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src/HOL/AxClasses/Product.thy
author paulson
Wed, 04 Jul 2007 13:56:26 +0200
changeset 23563 42f2f90b51a6
parent 16417 9bc16273c2d4
permissions -rw-r--r--
simplified a proof

(*  Title:      HOL/AxClasses/Product.thy
    ID:         $Id$
    Author:     Markus Wenzel, TU Muenchen
*)

theory Product imports Main begin

axclass product < type

consts
  product :: "'a::product => 'a => 'a"    (infixl "[*]" 70)


instance bool :: product
  by intro_classes

defs (overloaded)
  product_bool_def: "x [*] y == x & y"

end
isabelle