Polya, G <br/><br/>
How to solve it: New aspect of mathematical methods 

 - 2nd ed. 
 - New Jersey  Prenceton  1957 
 - xxi, 253 p., illus   
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<br/><br/><label>Subjects--Index Terms: </label>Mathematics  Number theory  Set theory  Group theory  Mathematical sciences  Pure mathematics  Fundamentals of mathematics  Arithmetic & algebra 
<br/><br/><label>Dewey Class. No.: </label>510.21