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src/HOL/AxClasses/Tutorial/Semigroups.thy
author wenzelm
Tue, 03 Oct 2000 01:15:11 +0200
changeset 10132 8e9a8ede2f11
parent 10007 64bf7da1994a
permissions -rw-r--r--
updated;

(*  Title:      HOL/AxClasses/Tutorial/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