Aggarwal, R. S.  <br/><br/>
A text book on set theory and number system / 
R. S. Aggarwal. 
 - 4th ed. 
 - New Delhi :  S. chand & com.,  c1989. 
 - viii, 197 pages :  illustrations ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Set theory.
<br/><br/><label>Dewey Class. No.: </label>511.322 AGG