An example of a simple connected surface bounding a region which is not simply connected.

DOI10.1073/PNAS.10.1.8zbMath50.0661.02OpenAlexW2071598504WikidataQ33763513 ScholiaQ33763513MaRDI QIDQ1458923

J. W. Alexander

Publication date: 1924

Published in: Proceedings of the National Academy of Sciences of the United States of America (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1073/pnas.10.1.8

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