00287nam a2200109Ia 4500008004100000082001700041100002200058245004400080250000900124260003500133300000900168240913s9999||||xx |||||||||||||| ||und||  a510.3  WEI/C  aEric W. Weisstein 0aCRC Concise Encyclopedia of Mathematics  aNULL  bChapman and HallaLondonc2006  a1969