Helmberg, Gilbert <br/><br/>
Introduction to spectral theory in hilbert space / 
Gilbert Helmberg. 
 - New York :  Dover Publications Inc.,  1997. 
 - xiii, 346 p. :  ill. ;  24 cm. 
<br/><br/>Including bibliography and index. 
<br/><br/><label>ISBN: </label>9780486466224 0486466221 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Spectral theory<br/>Hilbert space<br/>Linear operators
<br/><br/><label>Dewey Class. No.: </label>515.7222  / HEL