Hellwig, Gunter,  1926-, <br/><br/>
Differential operators of mathematical physics :  An introduction / 
Gunter hellwig ; translated from the German by bingitta hellwig 
 - 296 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cálculo operacional<br/>Espacio de Hilbert
<br/><br/><label>LC Class. No.: </label>QA432  / H44