Halmos, Paul R. 1916-2006. Naive set theory / Paul R. Halmos - Princeton ; N.J. : Van Nostrand, c1960 [reprint 1964]. - vii, 104 p. ; 23 cm. - The University series in undergraduate mathematics . Include index. Subjects--Topical Terms: Set theory.Arithmetic--Foundations. Dewey Class. No.: 511.322 / HAN 1964