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src/HOL/AxClasses/Semigroups.thy
author nipkow
Thu, 10 May 2001 17:28:40 +0200
changeset 11295 66925f23ac7f
parent 10681 ec76e17f73c5
child 12338 de0f4a63baa5
permissions -rw-r--r--
improved tracing of permutative rules.

(*  Title:      HOL/AxClasses/Semigroups.thy
    ID:         $Id$
    Author:     Markus Wenzel, TU Muenchen
    License:    GPL (GNU GENERAL PUBLIC LICENSE)
*)

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