Halmos, Paul R.  1916-2006 <br/><br/>
Introduction to Hilbert space and the theory of spectral multiplicity / 
by Paul R. Halmos. 
 - 2nd ed. 
 - New York :  Chelsea,  c1957. 
 - 114 p. ;  24 cm. 
<br/><br/>Includes bibliography  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spectral theory (Mathematics).<br/>Hilbert space.
<br/><br/><label>Dewey Class. No.: </label>515.733  / HAI 1957