Halmos, Paul R <br/><br/>
A Hilbert space problem book 

 - 2 
 - New Delhi  Springer  1984 
 - xvii, 369p.   
<br/><br/> Includes bubliographical references and index 
<br/><br/><label>ISBN: </label>9788184898323 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hilbert spaces -- Problems, excercises<br/>Mathematics