Danny Ofek

collaborators

3 papers

math.AG2026

Finite abelian subgroups of algebraic groups

Danny Ofek, Zinovy Reichstein, Federico Scavia

Let $k$ be an algebraically closed field, and let $G$ be an algebraic $k$ -group. We study finite abelian $k$ -subgroups $A \subset G$ whose order is not divisible by the characteris…

math.GR2024

Lower bounds on the essential dimension of reductive groups

Danny Ofek

We introduce a technique for proving lower bounds on the essential dimension of split reductive groups. As an application, we strengthen the best previously known lower bounds for…

math.GR2024

Essential dimension of cohomology classes via valuation theory

Danny Ofek, Zinovy Reichstein

We give a formula for the essential dimension of a cohomology class $α$ in $H^{d} (K, Q_{p} / Z_{p} (d))$ when $K$ is a strictly Henselian field. This formula is particula…