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arXiv · 1603.01710

Locally toroidal polytopes of rank 6 and sporadic groups

Dmitrii V. Pasechnik
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Abstract

We augment the list of finite universal locally toroidal regular polytopes of type {3,3,4,3,3} due to P.McMullen and E.Schulte, adding as well as removing entries. This disproves a related long-standing conjecture. Our new universal polytope is related to a well-known Y-shaped presentation for the sporadic simple group $Fi_{22}$, and admits $S_4\times O_8^+(2){:}S_3$ as the automorphism group. We also discuss further extensions of its quotients in the context of Y-shaped presentations. As well, we note that two known examples of finite universal polytopes of type {3,3,4,3,3} are related to Y-shaped presentations of orthogonal groups over GF(2). Mixing construction is used in a number of places to describe covers and 2-covers.

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Dmitrii V. Pasechnik. 2016-03-05. Locally toroidal polytopes of rank 6 and sporadic groups. https://doi.org/10.1016/j.aim.2017.03.029

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