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Improved upper bounds for the number of points on curves over finite fields

Everett W. Howe, Kristin E. Lauter (2003)

Annales de l’institut Fourier

We give new arguments that improve the known upper bounds on the maximal number N q ( g ) of rational points of a curve of genus g over a finite field 𝔽 q , for a number of pairs ( q , g ) . Given a pair ( q , g ) and an integer N , we determine the possible zeta functions of genus- g curves over 𝔽 q with N points, and then deduce properties of the curves from their zeta functions. In many cases we can show that a genus- g curve over 𝔽 q with N points must have a low-degree map to another curve over 𝔽 q , and often this is enough to...

Indice des unités elliptiques dans les p -extensions

Hassan Oukhaba (2007)

Bulletin de la Société Mathématique de France

Nous comparons le comportement dans les p -extensions du nombre de classes d’idéaux avec le comportement de l’indice du groupe des unités elliptiques de Rubin.

Inductivity of the global root number

David E. Rohrlich (2013)

Acta Arithmetica

Under suitable hypotheses, we verify that the global root number of a motivic L-function is inductive (invariant under induction).

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