Eccles, Peter J. <br/><br/>
An introduction to mathematical reasoning :  numbers, sets, and functions / 
Peter J. Eccles. 
 - Cambridge :  Cambridge University Press,  1997. 
 - xii, 350 p. ;  24 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0521592690 (hardback) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Proof theory.