Media type: E-Article Title: 3500 Contributor: Gibson, Emma M.; Leith, J. D. imprint: JSTOR, 1932 Published in: The American Mathematical Monthly, 39 (1932) 7, Seite 430 Language: English DOI: 10.2307/2300399 ISSN: 0002-9890 Keywords: General Mathematics Origination: Footnote: Access State: Open Access