Today, November 29, is AMS Day! Join our celebration of AMS members and explore special offers on AMS publications, membership and more. Offers end 11:59pm EST.
ISSN 1088-9485(online) ISSN 0273-0979(print)
Robert E. Moritz and R. C. Archibald
Bull. Amer. Math. Soc. 22 (1916), 398-401
Full-text PDF Free Access