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We show that on a generic curve, a bundle obtained by successive extensions is stable. We compute the dimension of the set of such extensions. We use degeneration methods specializing the curve to a chain of elliptic components

Algebraic Geometry · Mathematics 2024-12-11 Montserrat Teixidor i Bigas

We present a generalization of a formula of higher order derivatives and give a short proof.

Classical Analysis and ODEs · Mathematics 2016-06-28 Ulrich Abel

The purpose of this paper is to present a solution to perhaps the final remaining case in the line of study concerning the generalization of Forelli's theorem on the complex analyticity of the functions that are: (1) $\mathcal{C}^\infty$…

Complex Variables · Mathematics 2014-02-27 Jae-Cheon Joo , Kang-Tae Kim , Gerd Schmalz

We study the general rational trigonometry of a tetrahedron, based on quadrances, spreads and solid spreads, using vector products associated to an arbitrary symmetric bilinear form over a general field, not of characteristic two. This…

Metric Geometry · Mathematics 2021-08-17 Gennady A Notowidigdo , Norman J Wildberger

Generalized cycles can be thought of as the extension of form-cycle duality between holomorphic forms and cycles, to meromorphic forms and generalized cycles. They appeared as an ubiquitous tool in the study of spectral curves and…

Mathematical Physics · Physics 2024-05-24 B. Eynard

This paper focuses on a generalization of the *-product called $\mathbf{C}$-product. This product, first introduced by Durante, Klement and Quesada-Molina, was used to characterize classes of compatible copulas. The $\mathbf{C}$-product of…

Statistics Theory · Mathematics 2012-04-10 Pongpol Ruankong , Songkiat Sumetkijakan

We give an elementary proof of the group law for elliptic curves using explicit formulas.

Algebraic Geometry · Mathematics 2017-10-03 Stefan Friedl

We examine pairs of closed plane curves that have the same closing property as two conic sections in Poncelet's porism. We show how the vertex curve can be computed for a given envelope and vice versa. Our formulas are universal in the…

Differential Geometry · Mathematics 2025-09-15 Norbert Hungerbühler , Micha Wasem

We resolve a conjecture of Rystov concerning products of matrices, that generalizes the \v{C}ern\'y Conjecture.

Combinatorics · Mathematics 2013-06-25 Noam Lifshitz , Ciaran Mullan , Boaz Tsaban

We prove very general index formulae for integral Galois modules, specifically for units in rings of integers of number fields, for higher K-groups of rings of integers, and for Mordell-Weil groups of elliptic curves over number fields.…

Number Theory · Mathematics 2015-10-12 Alex Bartel , Bart de Smit

Linear-constraint loops are programs whose transition relation is specified by a system of linear inequalities. The termination problem asks, given a loop, whether it admits an infinite computation. Decidability of termination remains open…

Logic in Computer Science · Computer Science 2026-05-15 Mishel Carelli

We define Galois coverings on tropical curves for which a Galois correspondence and a universal mapping property hold.

Algebraic Geometry · Mathematics 2022-01-19 JuAe Song

Our main result is that any real cubic algebraic number has a continued fraction expansion with polynomial coefficients. Some generalizations are mentioned.

Number Theory · Mathematics 2025-02-28 Henri Cohen

We define graph products of families of pairs of groups and study the question when two such graph products are commensurable. As an application we prove linearity of certain graph products.

Group Theory · Mathematics 2014-10-01 Tadeusz Januszkiewicz , Jacek Swiatkowski

We fully classify completely multiplicative sequences which are given by generalised polynomial formulae, and obtain a similar result for (not necessarily completely) multiplicative sequences under the additional restriction that the…

Number Theory · Mathematics 2024-03-27 Jakub Konieczny

We prove a generalization of the polarization identity of linear algebra expressing the inner product of a complex inner product space in terms of the norm, where the field of scalars is extended to an associative algebra equipped with an…

Rings and Algebras · Mathematics 2023-02-07 Chase Bender , Debraj Chakrabarti

The notion of a generalized product, refining that of a (symmetric and smooth) simplicial space is introduced and shown to imply the existence of an algebra of pseudodifferential operators. This encompasses many constructions of such…

Differential Geometry · Mathematics 2024-12-19 Richard B. Melrose

In the note some construction of Lie algebras is introduced. It is proved that the construction has the same property as a well known wreath product of groups [1]: Any extension of groups can be embedded into their wreath product [2].

Rings and Algebras · Mathematics 2011-07-08 Lev Simonian

We generalize a result of Chen concerning an isogeny between products of jacobians of modular curves associated to subgroups of GL(2,F_p). This generalization concerns objects with an action by GL(2,F) with F an arbitrary finite field, in…

Number Theory · Mathematics 2007-05-23 Bart de Smit , Bas Edixhoven

We prove that all elliptic curves defined over the cyclotomic $\mathbb{Z}_p$-extension of a real quadratic field are modular under the assumption that the algebraic part of the central value of a twisted $L$-function is a $p$-adic unit. Our…

Number Theory · Mathematics 2022-06-28 Sho Yoshikawa