Displaying 1081 – 1100 of 1554

Showing per page

Representations of multivariate polynomials by sums of univariate polynomials in linear forms

A. Białynicki-Birula, A. Schinzel (2008)

Colloquium Mathematicae

The paper is concentrated on two issues: presentation of a multivariate polynomial over a field K, not necessarily algebraically closed, as a sum of univariate polynomials in linear forms defined over K, and presentation of a form, in particular a zero form, as the sum of powers of linear forms projectively distinct defined over an algebraically closed field. An upper bound on the number of summands in presentations of all (not only generic) polynomials and forms of a given number of variables and...

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 ?

S -integral points on elliptic curves - Notes on a paper of B. M. M. de Weger

Emanuel Herrmann, Attila Pethö (2001)

Journal de théorie des nombres de Bordeaux

In this paper we give a much shorter proof for a result of B.M.M de Weger. For this purpose we use the theory of linear forms in complex and p -adic elliptic logarithms. To obtain an upper bound for these linear forms we compare the results of Hajdu and Herendi and Rémond and Urfels.

S -integral solutions to a Weierstrass equation

Benjamin M. M. de Weger (1997)

Journal de théorie des nombres de Bordeaux

The rational solutions with as denominators powers of 2 to the elliptic diophantine equation y 2 = x 3 - 228 x + 848 are determined. An idea of Yuri Bilu is applied, which avoids Thue and Thue-Mahler equations, and deduces four-term ( S -) unit equations with special properties, that are solved by linear forms in real and p -adic logarithms.

Searching for Diophantine quintuples

Mihai Cipu, Tim Trudgian (2016)

Acta Arithmetica

We consider Diophantine quintuples a, b, c, d, e. These are sets of positive integers, the product of any two elements of which is one less than a perfect square. It is conjectured that there are no Diophantine quintuples; we improve on current estimates to show that there are at most 5 . 441 · 10 26 Diophantine quintuples.

Siegel’s theorem and the Shafarevich conjecture

Aaron Levin (2012)

Journal de Théorie des Nombres de Bordeaux

It is known that in the case of hyperelliptic curves the Shafarevich conjecture can be made effective, i.e., for any number field k and any finite set of places S of k , one can effectively compute the set of isomorphism classes of hyperelliptic curves over k with good reduction outside S . We show here that an extension of this result to an effective Shafarevich conjecture for Jacobians of hyperelliptic curves of genus g would imply an effective version of Siegel’s theorem for integral points on...

Currently displaying 1081 – 1100 of 1554