Wohlgemuth, Andrew. <br/><br/>
Introduction to proof in abstract mathematics / 
Andrew Wohlgemuth. 
 - Philadelphia :  Saunders College ,  c1990. 
 - xii, 366 p. ;  25 cm. 
 - The Saunders series. .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>003026782X (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Proof theory.