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Restricted set addition in Abelian groups: results and conjectures

Vsevolod F. Lev (2005)

Journal de Théorie des Nombres de Bordeaux

We present a system of interrelated conjectures which can be considered as restricted addition counterparts of classical theorems due to Kneser, Kemperman, and Scherk. Connections with the theorem of Cauchy-Davenport, conjecture of Erdős-Heilbronn, and polynomial method of Alon-Nathanson-Ruzsa are discussed.The paper assumes no expertise from the reader and can serve as an introduction to the subject.

Restriction theory of the Selberg sieve, with applications

Ben Green, Terence Tao (2006)

Journal de Théorie des Nombres de Bordeaux

The Selberg sieve provides majorants for certain arithmetic sequences, such as the primes and the twin primes. We prove an L 2 L p restriction theorem for majorants of this type. An immediate application is to the estimation of exponential sums over prime k -tuples. Let a 1 , , a k and b 1 , , b k be positive integers. Write h ( θ ) : = n X e ( n θ ) , where X is the set of all n N such that the numbers a 1 n + b 1 , , a k n + b k are all prime. We obtain upper bounds for h L p ( 𝕋 ) , p > 2 , which are (conditionally on the Hardy-Littlewood prime tuple conjecture) of the correct order...

Résultats élémentaires sur certaines équations diophantiennes

Pierre Samuel (2002)

Journal de théorie des nombres de Bordeaux

Dans des travaux profonds, W. Ljunggren a montré que, pour a > 0 donné, les équations diophantiennes x 4 - a y 2 = 1 and x 2 - a y 4 = 1 ont au plus 1 ou 2 solutions non triviales. Par des méthodes élémentaires, je réponds ici à la question : pour quelles valeurs de a , premières ou analogues, ont-elles des solutions non-triviales ?

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