00257nam a2200097Ia 4500008004100000100003700041245003300078260002300111300000900134650001600143190216s9999||||xx |||||||||||||| ||und||  a"Raisinghania M D, Aggarwal R S" 0aSet Theory And Number System  bS Chand & Coc1982  a148p  aMathematics