Bulletin of the American Mathematical Society

ISSN 1088-9485(online) ISSN 0273-0979(print)

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Notes

Journal: Bull. Amer. Math. Soc. 46 (1940), 599-601
DOI: https://doi.org/10.1090/S0002-9904-1940-07243-X
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DOI: https://doi.org/10.1090/S0002-9904-1940-07243-X