Mercurial Mercurial > repos > isabelle / file revision
summary | shortlog | changelog | graph | tags | bookmarks | branches | files | changeset | file | latest | revisions | annotate | diff | comparison | raw | help
Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
src/HOL/AxClasses/Semigroups.thy
author wenzelm
Thu, 03 Jul 2008 20:15:06 +0200
changeset 27482 c686f9abc99c
parent 16417 9bc16273c2d4
permissions -rw-r--r--
removed old NSPrimes, cf. NSA/Examples/;

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

theory Semigroups imports Main begin

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

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


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

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

end
isabelle