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File:Alexander horned sphere construction (Alexander 1924).jpg

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Construction of Alexander's horned sphere

Summary

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Description
English: Diagram of the first few iterative steps in the construction of Alexander's horned sphere, from Alexander's original 1924 paper.
Date
Source Alexander, J. W. (1924), "An Example of a Simply Connected Surface Bounding a Region which is not Simply Connected", Proceedings of the National Academy of Sciences of the United States of America, National Academy of Sciences, 10 (1): 8–10
Author Alexander, J. W.

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Alexander_horned_sphere_construction_(Alexander_1924).jpg

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