The Schläfli symbol for the dual polytope is just the original symbol written backwards: {3, 3} is self-dual, {3, 4} is dual to {4, 3}, {4, 3, 3} to {3, 3, 4} and so on.
=== В размерности "n" = 4 ===Существует 6 правильных четырёхмерных многогранников:* 4-мерный симплекс (грань — тетраэдр, символ Шлефли {3, 3, 3}).