Lipschutz, Seymour <br/><br/>
Discrete mathematics 
SeymourLipschutz 
 - 3rd 
 - New Delhi  Tata McGraw Hill  2010 
 - varriable 
 - Schaum's outline .
<br/><br/><label>ISBN: </label>80070669123 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Discrete mathematics
<br/><br/><label>Dewey Class. No.: </label>511.1 LI-D