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p -adic Abelian Stark conjectures at s = 1

David Solomon (2002)

Annales de l’institut Fourier

A p -adic version of Stark’s Conjecture at s = 1 is attributed to J.-P. Serre and stated (faultily) in Tate’s book on the Conjecture. Building instead on our previous paper (and work of Rubin) on the complex abelian case, we give a new approach to such a conjecture for real ray-class extensions of totally real number fields. We study the coherence of our p -adic conjecture and then formulate some integral refinements, both alone and in combination with its complex analogue. A ‘Weak Combined Refined’ version...

Paramétrisation de structures algébriques et densité de discriminants

Karim Belabas (2003/2004)

Séminaire Bourbaki

La composition de Gauss donne une structure de groupe aux orbites de formes quadratiques binaires entières de discriminant D , sous l’action de SL 2 par changement de variable, essentiellement le groupe des classes de l’ordre quadratique de discriminant  D . Les domaines fondamentaux associés permettent calculs explicites et évaluation d’ordres moyens. Je présenterai les lois de composition supérieures découvertes par M. Bhargava à partir de la classification des espaces vectoriels préhomogènes réguliers,...

Patterns and periodicity in a family of resultants

Kevin G. Hare, David McKinnon, Christopher D. Sinclair (2009)

Journal de Théorie des Nombres de Bordeaux

Given a monic degree N polynomial f ( x ) [ x ] and a non-negative integer , we may form a new monic degree N polynomial f ( x ) [ x ] by raising each root of f to the th power. We generalize a lemma of Dobrowolski to show that if m < n and p is prime then p N ( m + 1 ) divides the resultant of f p m and f p n . We then consider the function ( j , k ) Res ( f j , f k ) mod p m . We show that for fixed p and m that this function is periodic in both j and k , and exhibits high levels of symmetry. Some discussion of its structure as a union of lattices is also given.

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