In Klein's famous example of regular 14-gon made of 336 copies of (2,3,7) triangles, he used identification for edges such that side 2i+1 is identified with side 2i+6 (mod 14). But I wonder how could he find the identifications? Do you know the clue? Thank you!
2026-03-27 23:13:00.1774653180
Identification of polygon edges
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