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The geometry of the third moment of exponential sums

Florent Jouve (2008)

Journal de Théorie des Nombres de Bordeaux

We give a geometric interpretation (and we deduce an explicit formula) for two types of exponential sums, one of which is the third moment of Kloosterman sums over F q of type K ( ν 2 ; q ) . We establish a connection between the sums considered and the number of F q -rational points on explicit smooth projective surfaces, one of which is a K 3 surface, whereas the other is a smooth cubic surface. As a consequence, we obtain, applying Grothendieck-Lefschetz theory, a generalized formula for the third moment of Kloosterman...

The joint distribution of Q -additive functions on polynomials over finite fields

Michael Drmota, Georg Gutenbrunner (2005)

Journal de Théorie des Nombres de Bordeaux

Let K be a finite field and Q K [ T ] a polynomial of positive degree. A function f on K [ T ] is called (completely) Q -additive if f ( A + B Q ) = f ( A ) + f ( B ) , where A , B K [ T ] and deg ( A ) < deg ( Q ) . We prove that the values ( f 1 ( A ) , ... , f d ( A ) ) are asymptotically equidistributed on the (finite) image set { ( f 1 ( A ) , ... , f d ...

The reduced ideals of a special order in a pure cubic number field

Abdelmalek Azizi, Jamal Benamara, Moulay Chrif Ismaili, Mohammed Talbi (2020)

Archivum Mathematicum

Let K = ( θ ) be a pure cubic field, with θ 3 = D , where D is a cube-free integer. We will determine the reduced ideals of the order 𝒪 = [ θ ] of K which coincides with the maximal order of K in the case where D is square-free and ¬ ± 1 ( mod 9 ) .

Transformation de Fourier homogène

Gérard Laumon (2003)

Bulletin de la Société Mathématique de France

Dans leur démonstration de la correspondance de Drinfeld-Langlands, Frenkel, Gaitsgory et Vilonen utilisent la transformation de Fourier géométrique, ce qui les oblige à travailler soit avec les faisceaux -adiques en caractéristique p > 0 , soit avec les 𝒟 -Modules en caractéristique 0 . En fait, ils n’utilisent cette transformation de Fourier géométrique que pour des faisceaux homogènes pour lesquels on s’attend à avoir une transformation de Fourier sur . L’objet de cette note est de proposer une telle...

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