Results 111 to 120 of about 272,600 (222)

A Brumer-Stark Conjecture for non-abelian Galois extensions

open access: yes, 2014
The Brumer-Stark conjecture deals with abelian extensions of number fields and predicts that a group ring element, called the Brumer-Stickelberger element constructed from special values of L-functions associated to the extension, annihilates the ideal ...
Dejou, Gaëlle, Roblot, Xavier-François
core   +1 more source

Relation between commutative and non-commutative descriptions of D-branes in large R-R field background

open access: yesNuclear Physics B
We derive the Seiberg-Witten map to first order in the non-commutativity parameter for D-branes in the presence of a large R-R background field. This result enables a systematic investigation of the commutative formulation of the corresponding Lagrangian.
Chen-Te Ma
doaj   +1 more source

On the Galois module structure of units in met acyclic extensions [PDF]

open access: yes, 1996
Let Г be a metacyclic group of order pq with p and q prime. We shall show that the Г-cohomology and character of a Г-lattice determine its genus. Let N/L be a Galois extension with group Г, then U(_N), the torsion-free units of N, is a Г-lattice and the ...
McGaul, K.Y., McGaul, Karen Yvonne
core  

Torsion points of abelian varieties in abelian extensions

open access: yes, 1998
Let A be an abelian variety defined over a number field K and let Kab be the maximal abelian extension of K. We show that there only finitely many torsion points of A which are defined over Kab iff A has no abelian subvariety with complex multiplication over K.
openaire   +2 more sources

A characterisation of higher torsion classes

open access: yesForum of Mathematics, Sigma
Let $\mathcal {A}$ be an abelian length category containing a d-cluster tilting subcategory $\mathcal {M}$ . We prove that a subcategory of $\mathcal {M}$ is a d-torsion class if and only if it is closed under d-extensions and d ...
Jenny August   +5 more
doaj   +1 more source

An Extension of Warfield Duality for Abelian Groups

open access: yesJournal of Algebra, 1996
In 1968 R. B. Warfield, jun. showed how to adapt vector space duality to torsion-free abelian groups (hereafter, simply ``groups'') of finite rank. If \(A\) is a subgroup of the additive rationals, a group \(M\) is called \(A\)-locally free if \(M\) embeds as a subgroup of a (finite) product of copies of \(A\) and for each prime \(p\), \(pA=A\) implies
openaire   +2 more sources

Non-abelian extensions and Wells exact sequences of Lie-Yamaguti algebras [PDF]

open access: yes
The goal of the present paper is to investigate non-abelian extensions of Lie-Yamaguti algebras and explore extensibility of a pair of automorphisms about a non-abelian extension of Lie-Yamaguti algebras.
Li, Zhen, Sun, Qinxiu
core   +1 more source

On free Abelian extensions

open access: yesOsaka Journal of Mathematics, 1974
Picco, D. J., Platzeck, M. I.
openaire   +4 more sources

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