00289nam a2200097Ia 4500008004100000100002500041245003300066245002600099260000900125856005700134160531s9999    xx            000 0 und d  aHazawinkel, Michiel.  aEncyclopaedia of Mathematics  cby Michiel Hazewinkel  c2012  uhttps://www.encyclopediaofmath.org/index.php/Algebra