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src/HOL/AxClasses/Semigroups.thy
author wenzelm
Wed, 06 Dec 2000 21:32:25 +0100
changeset 10618 5b96bc5fbec3
parent 10134 537206cc738f
child 10681 ec76e17f73c5
permissions -rw-r--r--
deactivate Rational_Numbers (tmp!);

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

theory Semigroups = Main:

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

axclass semigroup < "term"
  assoc: "(x [*] y) [*] z = x [*] (y [*] z)"


consts
  plus :: "'a => 'a => 'a"    (infixl "[+]" 70)

axclass plus_semigroup < "term"
  assoc: "(x [+] y) [+] z = x [+] (y [+] z)"

end
isabelle