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Jan 5 at 0:36 history edited LSpice CC BY-SA 4.0
Link to book, while this is on the front page
Feb 27, 2022 at 14:07 comment added Nandakumar R Thanks. A statement attributed to Steinhaus is given on page 414: "every congruent faced 3-polytope has an even number of facets". One suspects whether the statement holds for non-convex 3-polytopes as well. I could not yet get to see the paper by Grunbaum you mention.
Feb 27, 2022 at 13:56 vote accept Nandakumar R
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S Feb 24, 2022 at 14:16 history answered user3816 CC BY-SA 4.0