No-Sided Professor

What Hacker News says

1. eternauta3kJul 2019
   Two recommendations:

   “The No-sided Professor,” by Martin Gardner, and “A Subway Named Moebius,” by A.J. Deutsch.

   http://www.carliner-remes.com/jacob/math/project/lit.htm

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2. JadeNBDec 2011
   This story is in either "Fantasia Mathematica" or "The Mathematical Magpie", both edited by Clifton Fadiman. I don't have my copies here to check, but a look at the table of contents suggests that it might be "The Hermeneutical Doughnut", by H. Nearing Jr. (Even if it's not, it's worth picking up the books to look; anyone who liked this story is guaranteed to like them.)

   EDIT: Sorry; on looking closer, it's clearly Gardner's "The No-Sided Professor" (http://en.wikipedia.org/wiki/Fantasia_Mathematica).

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