Intro to ASCII notation for coxeter-dynkin for regular polygons (dihedral symmetries)

Klitzing's reference: https://tinyurl.com/kz-polygons

0:00 - intro 1:10 - digonal symmetry 1:46 - o2o 2:30 - x2o 3:02 - o2x 3:50 - x2x 4:55 - triangular symmetry 5:53 - x3o 6:40 - o3o 7:00 - o3x 7:15 - duals 7:30 - x3x 8:26 - square symmetry 9:04 - o4o 9:25 - x4o 10:28 - o4x 10:54 - duals 11:12 - pentagonal symmetry 11:30 - o5o 11:43 - x5o 12:11 - o5x 12:20 - x5x and x4x 12:52 - outro