Halmos, Paul R. <br/><br/>
Introduction to Hilbert space and the theory of spectral multiplicity / 
by Paul R. Halmos 
 - 2nd ed. 
 - New York :  Chelsea Pub.,  c1957 
 - 114 p. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spectral theory (Mathematics)<br/>Hilbert space
<br/><br/><label>Dewey Class. No.: </label>513.8