Keene, G. B <br/><br/>
Abstract sets and finite ordinals : an introduction to the study of set theory 

 - Dover ed 
 - Mineola, NY:  Dover Publications,  2007 
 - vi, 106 p. : ill. ; 22 cm 
<br/><br/><label>ISBN: </label>9780486462493 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Logic, Symbolic and mathematical
<br/><br/><label>Dewey Class. No.: </label>511.322 KEE