• openAccess   On the Solvability of groups with four class sizes 

      Beltrán, Antonio; Felipe, Maria José World Scientific Publishing (2012)
      It is shown that if the set of conjugacy class sizes of a nite group G is f1; m; n;mng, where m; n are positive integers which do not divide each other, then G is up to central factors a fp; qg-group. In particular, G ...