79

This number is a prime.

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Egon Schulte showed that there are 79 skeletal polyhedra and polygonal complexes in ordinary Euclidean 3-space, which are finite or infinite 3-periodic structures, including 6 infinite families of "chiral" apeirohedra. [Post]

Submitted: 2014-03-12 15:41:26; Last Modified: 2022-02-19 23:46:24.