Levy, Azriel <br/><br/>
A hierarchy of formulas in set theory 
by Azriel Levy 
 - Providence, Rhode Island  American Mathematical Society  1965 
 - 76 p  24 cm 
 - Seria Memoirs of the American Mathematical Society  Nr. 57 .
<br/><br/> Contine bibliogr 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teoria multimilor<br/>Logica matematica
<br/><br/><label>Dewey Class. No.: </label>510.6