00351nam a2200133Ia 4500008004100000082001800041100002000059245002300079260005800102300000800160650001600168650001800184653001500202170901s1960    xx            000 0 und d  a511.322bH18N  aHalmos, Paul R. 0aNaïve Set Theory  aNew DelhibAffiliated East-West Press Pvt. Ltd.c1960  a104  aMathematics  aPure Sciences  aSet theory