On Fano-Enriques threefolds

Let $U\subset \mathbb P^N$ be a projective variety which is not a cone and whose hyperplane sections are smooth Enriques surfaces. We prove that the degree of a $U$ is at most 32 and the bound is sharp.Comment: 18 pages, LaTe

Simple finite subgroups of the Cremona group of rank 3

We classify all finite simple subgroups in the Cremona group of rank 3Comment: 32 pages, late