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20132019
most citedOn the inner structure of a permutation: Bicolored Partitions and Eulerians, Trees and Primitives

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math.RT2015

On 3 and 4 dimensional regular solids, Part 1: The 4-simplex generates the free group

Adrian Ocneanu

The 4-simplex has vertices 5 unit quaternions, which we arrange so that one of them is the unit. We show that the remaining 4 vertices are the generators of a free group. For the p…