The material for the course has been drawn from many sources. The author
is chiefly indebted to the classical works of Reye, Cremona, Steiner,
Poncelet, and Von Staudt. Acknowledgments and thanks are also due to
Professor Walter C. Eells, of the U.S. Naval Academy at Annapolis, for his
searching examination and keen criticism of the manuscript; also to
Professor Herbert Ellsworth Slaught, of The University of Chicago, for his
many valuable suggestions, and to Professor B. M. Woods and Dr. H. N.
Wright, of the University of California, who have tried out the methods of
presentation, in their own classes.

D. N. LEHMER

BERKELEY, CALIFORNIA





CONTENTS


Preface
Contents
CHAPTER I - ONE-TO-ONE CORRESPONDENCE
1. Definition of one-to-one correspondence
2. Consequences of one-to-one correspondence
3. Applications in mathematics
4. One-to-one correspondence and enumeration
5. Correspondence between a part and the whole