Document Type

Article

Publication Date

9-1952

Notes/Citation Information

Published in Duke Mathematical Journal, v. 19, no. 3, p. 447-457.

This article is republished by permission of the copyright holder, Duke University Press. Reuse of material, except as citation, is subject to Duke University Press’s permission.

Digital Object Identifier (DOI)

http://dx.doi.org/10.1215/S0012-7094-52-01945-5

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Mathematics Commons

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