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Invariants of the finite orthogonal groups in odd dimension and even characteristic

H. E. A. Campbell, R. J. Shank, D. L. Wehlau

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Source: Crossref

Published: Jun 1, 2026

DOI: 10.1112/jlms.70597

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Source abstract

Abstract We describe the ring of invariants for the finite orthogonal groups in odd dimension and even characteristic acting on the defining representation. We construct a minimal algebra generating set and describe the relations amongst the generators. This ring of invariants is shown to be a complete intersection and thus is Cohen–Macaulay. This extends the previous computation of Kropholler, Mohseni Rajaei, and Segal valid over the field of order 2.

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Invariants of the finite orthogonal groups in odd dimension and even characteristic — Mathematical Frontier Network