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Figure 4
Feynman's first lecture in Feynman et al. (1971BB16) has a table (redrawn here in a simpler form) of seven cubic crystals that all differ by their periodic structures (purely geometrically) as in Definition 3[link] after we ignore all chemical elements.

Volume 11| Part 4| July 2024| Pages 453-463
ISSN: 2052-2525