Rellich, Franz. <br/><br/>
Perturbation theory of eigenvalue problems / 
by Franz Rellich ; a ssisted by J. Berkowitz. 
 - New York :  Gordon and Breach ,  1969. 
 - x, 127 p. ;  24 cm. 
 - Notes on mathematics and its applications .
<br/><br/> "Taken from lectures given by Professor Rellich at New York Universi ty in 1953." 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Functional analysis.<br/>Perturbation (Mathematics).<br/>Eigenvalues.
<br/><br/><label>Dewey Class. No.: </label>517.5 REL