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Richeson seems quite stoked to have discovered the article about him, and mentioned a few bits in the article to possible clarify: The Euler characteristic isn't only for convex polyhedra, and Tales of Impossibility is about four problems, not three (also constructibility of regular polygons). Just passing it on as he is reluctant to comment directly on the article. (source: twitter) Schazjmd(talk) 18:32, 7 March 2020 (UTC)[reply]
