Media type: E-Article Title: Mathematical Notes Contributor: Schweizer, B.; Sklar, A.; Crowe, D. W.; Kolodner, I. I.; Hellmann, Marshall S.; Goldberg, K.; Horn, Alfred; Leuenberger, F.; Sugai, Iwao; Rajagopal, A. K. imprint: Informa UK Limited, 1961 Published in: The American Mathematical Monthly Language: English DOI: 10.1080/00029890.1961.11989765 ISSN: 0002-9890; 1930-0972 Keywords: General Mathematics Origination: Footnote: Access State: Open Access