Butzer Paul L <br/><br/>
Semi-groups of operators and approxiamation 
Butzer Paul L; Berens Hubert 
 -  1967 
 - p.  cm. 
 - Die grundlehren der mathematischen wissenschaften; 145 .
<br/><br/><label>Standard No.: </label>29442 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Operator and approximation<br/>Functional analysis
<br/><br/><label>Dewey Class. No.: </label>B43, K71