Chapter 12 proof  Block IV (Chapters 10-13) 

 - Walton  Open University  1995 
 - 52p.  29cm 
<br/><br/><label>ISBN: </label>0335142818 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical principles
<br/><br/><label>Dewey Class. No.: </label>004.0151  / OPE