Similitudes over fields with I^4=0
Number Theory
2026-02-26 v1
Abstract
This article studies the set of R-equivalence classes of the group of proper projective similitudes of an algebra with involution of the first kind. The main results concern base fields of characteristic different from 2 over which every 9-dimensional quadratic form has a nontrivial zero. This includes function fields of p-adic curves and extensions of transcendence degree 3 of C. Main results of [28] and [29] are extended by relaxing the condition on the base field as well as on the Clifford invariant for orthogonal involutions.
Cite
@article{arxiv.2602.22147,
title = {Similitudes over fields with I^4=0},
author = {M. Archita and Karim Johannes Becher},
journal= {arXiv preprint arXiv:2602.22147},
year = {2026}
}
Comments
22 pages