Today, November 30th, 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)
Bull. Amer. Math. Soc. 53 (1947), 1134-1139
Full-text PDF Free Access