... topology¹

See Astounding Science Fiction for March, 1954: ``Topology'' by J. G. Hocking.

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...)²

The Moebius bands named after the German topologist A. F. Moebius, is a one-sided, one-edged band formed by giving a strip of paper one half-twist before joining the ends. As used in this paper, the term refers to bands of an odd number of half-twists, which all have one side and one edge.

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