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arXiv · 2303.02013

Dembowski's Theorem on Finite Inversive Planes of Even Order

Bhaskar Bagchi
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Abstract

A remarkable theorem due to Peter Dembowski states that if $I$ is an inversive plane of even order $q$ then $q$ must be a power of two and $I$ must be the incidence system of points versus plane ovals in an ovoid in the projective $3$-space over the field of order $q$. In this paper we present a short and self-contained proof of this result. Our proof depends on the classification due to Benson of the symmetric and regular finite generalized quadrangles. Included here is a deduction of Benson's Theorem from the Dembowski-Wagner combinatorial characterization of finite projective geometries.

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Bhaskar Bagchi. 2023-03-03. Dembowski's Theorem on Finite Inversive Planes of Even Order. https://arxiv.org/abs/2303.02013

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