Universality lifting from a general base field
Vítězslav Kala
Charles University, Praha, Czech RepublicDaejun Kim
Korea University, Seoul, South KoreaSeok Hyeong Lee
Seoul National University, South Korea

Abstract
Given a totally real number field , we show that there are only finitely many totally real extensions of of a fixed degree that admit a universal quadratic form defined over . We further obtain several explicit classification results in the case of relative quadratic extensions.
Cite this article
Vítězslav Kala, Daejun Kim, Seok Hyeong Lee, Universality lifting from a general base field. Rev. Mat. Iberoam. 41 (2025), no. 6, pp. 2379–2400
DOI 10.4171/RMI/1565