Jonathan D. Lubin

collaborators

2 papers

math.NT2006

Extrinsic properties of automorphism groups of formal groups

Jonathan D. Lubin, Ghassan Y. Sarkis

We prove two conjectures on the automorphism group of a one-dimensional formal group law defined over a field of positive characteristic. The first is that if a series commutes wit…

math.AG2003

Raynaud's group-scheme and reduction of coverings

Dan Abramovich, Jonathan Lubin

The structure of the reduction of an admissible $G$ -covering $Y \to X$ at primes $p$ dividing $∣ G ∣$ is investigated. Assume $∣ G ∣$ is not divisible by $p^{2}$ and the $p$ -Sylow group…