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Proceedings/Recueil Des Communications Contemporary mathematics Année : 2022

Minimal quadratic forms for the function field of a conic in characteristic 2

Résumé

In this note, we construct explicit examples of $F_Q$-minimal quadratic forms of dimension $5$ and $7$, where $F_Q$ is the function field of a conic over a field $F$ of characteristic $2$. The construction uses the fact that any set of $n$ cyclic $p$ algebras over a field of characteristic $p$ can be described using only $n+1$ elements of the base field. It also uses a general result that provides an upper bound on the Witt index of an orthogonal sum of two regular anisotropic quadratic forms over a henselian valued field.

Dates et versions

hal-03858856 , version 1 (17-11-2022)

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Adam Chapman, Anne Quéguiner-Mathieu. Minimal quadratic forms for the function field of a conic in characteristic 2. Contemporary mathematics, 2022, Proceedings of the Amitsur centennial symposium. ⟨hal-03858856⟩
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