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We develop a new general method for computing the decomposition type of the normal bundle to a projective rational curve. This method is then used to detect and explain an example of a Hilbert scheme that parametrizes all the rational…

Algebraic Geometry · Mathematics 2016-04-21 Alberto Alzati , Riccardo Re

Let $C$ be a smooth non rational projective curve over the complex field $\mathbb{C}$. If $A$ is an abelian subvariety of the Jacobian $J(C)$, we consider the Abel-Prym map $\varphi_A : C \rightarrow A$ defined as the composition of the…

Algebraic Geometry · Mathematics 2020-02-10 Juliana Coelho , Kelyane Abreu

We characterize decomposable principally polarized abelian varieties of the form $E\times B$, with $E$ an elliptic curve, in two different ways, which are, surprisingly, completely analogous to classical results of curve theory concerning…

Algebraic Geometry · Mathematics 2026-05-11 Nelson Alvarado , Giuseppe Pareschi

Here we develop a regularity theory for a polyconvex functional in $2\times2-$dimensional compressible finite elasticity. In particular, we consider energy minimizers/stationary points of the functional…

Analysis of PDEs · Mathematics 2022-05-19 Marcel Dengler

Nonnegative measures that are solutions to a transport equation with continuous coefficients have been widely studied. Because of the low regularity of the associated vector field, there is no natural flow since nonuniqueness of integral…

Analysis of PDEs · Mathematics 2024-07-03 Nicolas Burq , Belhassen Dehman , Jérôme Le Rousseau

We study the algebraic curve over $\mathbb{F}_{q^2}$ defined by $y^{q+1} = x^n(x^n+1)$, where $n$ is a positive integer coprime to the characteristic. We first prove (when $q$ is odd) that the nonsingular model of this curve is…

Algebraic Geometry · Mathematics 2026-05-26 João Paulo Guardieiro , Yuri da Silva , Saeed Tafazolian

We study a particular plane curve over a finite field whose normalization is of genus 0. The number of rational points of this curve achieves the Aubry-Perret bound for rational curves. The configuration of its rational points and a…

Algebraic Geometry · Mathematics 2011-08-23 Satoru Fukasawa , Masaaki Homma , Seon Jeong Kim

In this paper, we introduce a new class of curves \alpha called a f-rectifying curves, which its f-position vector defined by {\alpha}_{f}(s)=\int f(s)T(s)ds always lie in the rectifying plane of \alpha, where f is an integrable function…

Differential Geometry · Mathematics 2022-01-25 Fouzi Hathout

Several convergence results in Hilbert scales under different source conditions are proved and orders of convergence and optimal orders of convergence are derived. Also, relations between those source conditions are proved. The concept of a…

Functional Analysis · Mathematics 2015-06-03 Gisela L. Mazzieri , Ruben D. Spies

We consider a simplified Boltzmann equation: spatially homogeneous, two-dimensional, radially symmetric, with Grad's angular cutoff, and linearized around its initial condition. We prove that for a sufficiently singular velocity cross…

Analysis of PDEs · Mathematics 2007-12-21 Nicolas Fournier

Let $C: y^2=f(x)$ be a hyperelliptic curve of genus $g\geq 1$, defined over a complete discretely valued field $K$, with ring of integers $O_K$. Under certain conditions on $C$, mild when residue characteristic is not $2$, we explicitly…

Number Theory · Mathematics 2024-11-20 Simone Muselli

We define and study the stack ${\mathcal U}^{ns,a}_{g,g}$ of (possibly singular) projective curves of arithmetic genus g with g smooth marked points forming an ample non-special divisor. We define an explicit closed embedding of a natural…

Algebraic Geometry · Mathematics 2017-10-18 Alexander Polishchuk

Regularization is a well studied problem in the context of neural networks. It is usually used to improve the generalization performance when the number of input samples is relatively small or heavily contaminated with noise. The…

Artificial Intelligence · Computer Science 2011-04-19 Salah Rifai , Xavier Glorot , Yoshua Bengio , Pascal Vincent

D. Bailey and R. E. Crandall recently formulated a "Hypothesis A", which provides a general principle to explain the (conjectured) normality of constants like pi or log 2 and other related numbers, to base 2 or other integer bases. This…

Number Theory · Mathematics 2007-05-23 Jeffrey C. Lagarias

Variational convexity, together with ist strong counterpart, of extended-real-valued functions has been recently introduced by Rockafellar. In this paper we present second-order characterizations of these properties, i.e., conditions using…

Optimization and Control · Mathematics 2025-02-04 Helmut Gfrerer

Given a local ring $(R,\mathfrak{m})$ and an elliptic curve $E(R/\mathfrak{m})$, we define elliptic loops as the points of $\mathbb{P}^2(R)$ projecting to $E$ under the canonical modulo-$\mathfrak{m}$ reduction, endowed with an operation…

Commutative Algebra · Mathematics 2023-05-18 Massimiliano Sala , Daniele Taufer

We investigate the regularity of the strongly continuous semigroup associated with a system of two coupled second order evolution equations with indirect damping, whose stability was recently studied by Hao et al. By deriving the asymptotic…

Analysis of PDEs · Mathematics 2025-08-29 Chenxi Deng , Zhaobin Kuang , Zhuangyi Liu , Qiong Zhang

In this paper, we will study the arithmetic of the Eisenstein part of the modular Jacobians. In the first section, we introduce some general preliminaries of the arithmetic theory of modular curves that we will need later. In the second…

Number Theory · Mathematics 2016-12-28 Yuan Ren

The study of periodic solutions with constant sign in the Abel equation of the second kind can be made through the equation of the first kind. This is because the situation is equivalent under the transformation $x\mapsto x^{-1}$, and there…

Classical Analysis and ODEs · Mathematics 2012-05-02 Josep M. Olm , Xavier Ros-Oton , Tere M. Seara

We prove the validity of regularizing properties of a double layer potential associated to the fundamental solution of a {\em nonhomogeneous} second order elliptic differential operator with constant coefficients in Schauder spaces by…

Analysis of PDEs · Mathematics 2021-03-15 Francesco Dondi , Massimo Lanza de Cristoforis
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