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Single polynomials that correspond to pairs of cyclotomic polynomials with interlacing zeros

James McKee, Chris Smyth (2013)

Open Mathematics

We give a complete classification of all pairs of cyclotomic polynomials whose zeros interlace on the unit circle, making explicit a result essentially contained in work of Beukers and Heckman. We show that each such pair corresponds to a single polynomial from a certain special class of integer polynomials, the 2-reciprocal discbionic polynomials. We also show that each such pair also corresponds (in four different ways) to a single Pisot polynomial from a certain restricted class, the cyclogenic...

Small discriminants of complex multiplication fields of elliptic curves over finite fields

Igor E. Shparlinski (2015)

Czechoslovak Mathematical Journal

We obtain a conditional, under the Generalized Riemann Hypothesis, lower bound on the number of distinct elliptic curves E over a prime finite field 𝔽 p of p elements, such that the discriminant D ( E ) of the quadratic number field containing the endomorphism ring of E over 𝔽 p is small. For almost all primes we also obtain a similar unconditional bound. These lower bounds complement an upper bound of F. Luca and I. E. Shparlinski (2007).

Small generators of function fields

Martin Widmer (2010)

Journal de Théorie des Nombres de Bordeaux

Let 𝕂 / k be a finite extension of a global field. Such an extension can be generated over k by a single element. The aim of this article is to prove the existence of a ”small” generator in the function field case. This answers the function field version of a question of Ruppert on small generators of number fields.

Small points on a multiplicative group and class number problem

Francesco Amoroso (2007)

Journal de Théorie des Nombres de Bordeaux

Let V be an algebraic subvariety of a torus 𝔾 m n n and denote by V * the complement in V of the Zariski closure of the set of torsion points of V . By a theorem of Zhang, V * is discrete for the metric induced by the normalized height h ^ . We describe some quantitative versions of this result, close to the conjectural bounds, and we discuss some applications to study of the class group of some number fields.

Solution des problèmes de Favard

Michel Langevin (1988)

Annales de l'institut Fourier

Pour tout c < 2 , on calcule un rang D ( c ) tel que tout entier algébrique x de degré au moins D ( c ) ait deux conjugués x ' , x ' ' vérifiant | x ' - x ' ' | c . De plus, on donne une nouvelle preuve de l’égalité D ( 3 ) = 2 .

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