Halmos, Paul R. (Paul Richard), 1916-  Halmos, Paul R. (Paul Richard), 1916- <br/><br/>
Naive set theory. 

 - Princeton, NJ :  Van Nostrand,  [1965 reprint] 
 - University series in undergraduate mathematics .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Set theory.<br/>Arithmetic -- Foundations.--Arithmetic -- Foundations.