A new upper bound for the cross number of finite Abelian groups

The first is to provide a series of upper and lower bounds for the number of points on an abelian variety defined over a finite field... cobian of a curve or the Prym variety of

Let us now give a general upper bound on the size of t -marginal sets that shows that taking t disjoint Baer subplanes is the best we can do in order to obtain a large enough