Media type: E-Article Title: 2865 Contributor: Rosenbaum, Joseph; Wilmer, F. L.; Dunkel, Otto imprint: Informa UK Limited, 1922 Published in: The American Mathematical Monthly Language: Not determined DOI: 10.2307/2972600 ISSN: 0002-9890 Keywords: General Mathematics Origination: Footnote: Access State: Open Access