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We consider quasilinear elliptic systems in divergence form. In general, we cannot expect that weak solutions are locally bounded because of De Giorgi's counterexample. Here we assume a condition on the support of off-diagonal coefficients…

Analysis of PDEs · Mathematics 2019-11-15 Salvatore Leonardi , Francesco Leonetti , Cristina Pignotti , Eugenio Rocha , Vasile Staicu

Any counterexample to the two-dimensional Jacobian Conjecture gives a rational map from one projective plane to another. We use some ideas of the Minimal Model Program to study the combinatorial structure of a rational surface, that is…

Algebraic Geometry · Mathematics 2009-12-25 Alexander Borisov

We establish the exact overlaps conjecture for iterated functions systems on the real line with algebraic contractions and arbitrary translations.

Dynamical Systems · Mathematics 2020-01-15 Ariel Rapaport

For metric spaces with curvature less than or equal to x, x<0, it is shown that a recurrent geodesic can be approximated by closed geodesics. A counter example is provided for the converse.

Geometric Topology · Mathematics 2007-05-23 Ch. Charitos , G. Tsapogas

We construct Zollfrei Lorentzian metrics on every nontrivial orientable circle bundle over a orientable closed surface. Further we prove a weaker version of Guillemin's conjecture assuming global hyperbolicity of the universal cover.

Differential Geometry · Mathematics 2014-02-24 Stefan Suhr

We present new counterexamples, which provide stronger limitations to sums-differences statements than were previously known. The main idea is to consider non-uniform probability measures.

Combinatorics · Mathematics 2014-10-06 Marius Lemm

Homological mirror symmetry for crepant resolutions of Gorenstein toric singularities leads to a pair of conjectures on certain hypergeometric systems of PDEs. We explain these conjectures and verify them in some cases.

Algebraic Geometry · Mathematics 2013-08-27 Lev A. Borisov , R. Paul Horja

We prove the $p$-parity conjecture for elliptic curves over global fields of characteristic $p > 3$. We also present partial results on the $\ell$-parity conjecture for primes $\ell \neq p$.

Number Theory · Mathematics 2019-02-20 Fabien Trihan , Christian Wuthrich

We study elimination theory in the context of Newton polytopes and develop its convex-geometric counterpart.

Algebraic Geometry · Mathematics 2010-08-03 Askold Khovanskii , Alexander Esterov

The group of piecewise projective homeomorphisms of the line provides straightforward counter-examples to the so-called von Neumann conjecture. The examples are so simple that many additional properties can be established.

Group Theory · Mathematics 2013-09-10 Nicolas Monod

In this note we elaborate on a recent counter-example to the Nelson-Seiberg theorem and to its generalizations. We provide sufficient conditions for the existence of such counter-examples, finding new ones. We claim that these…

High Energy Physics - Theory · Physics 2020-05-06 Antonio Amariti , Dario Sauro

The more recent paper "Generic strange duality for K3 surfaces" by the authors contains stronger results.

Algebraic Geometry · Mathematics 2010-05-04 Alina Marian , Dragos Oprea

The geometry conjecture, which was posed nearly a quarter of a century ago, states that the fixed point set of the composition of projectors onto nonempty closed convex sets in Hilbert space is actually equal to the intersection of certain…

Optimization and Control · Mathematics 2021-05-31 Salihah Alwadani , Heinz H. Bauschke , Julian P. Revalski , Xianfu Wang

We show that some mathematical results and their negations are both deducible. The derived contradictions indicate the inconsistency of current mathematics. This paper is an updated version of arXiv:math/0606635v3 with additional results…

General Mathematics · Mathematics 2007-08-15 Guang-Liang Li , Victor O. K. Li

We discuss some aspects of the theory of subelliptic estimates.

Complex Variables · Mathematics 2009-06-02 David W. Catlin , John P. D'Angelo

We give a geometric approach to the proof of the $\lambda$-lemma. In particular, we point out the role pseudoconvexity plays in the proof.

Complex Variables · Mathematics 2015-06-02 Eric Bedford , Tanya Firsova

In this paper, we pose many challenging conjectures on congruences involving binomial coefficients and Ap\'ery-like numbers.

Number Theory · Mathematics 2020-08-18 Zhi-Hong Sun

A comparison on some facts concerning the geometric quantization of symplectic manifolds is presented here. Criticism, facts and improvements on the sophisticated theory of geometric quantization are presented touching briefly, all the…

Symplectic Geometry · Mathematics 2022-05-03 Simone Camosso

We establish the equivalence of Gromov ellipticity and subellipticity in the algebraic category.

Algebraic Geometry · Mathematics 2023-01-10 Shulim Kaliman , Mikhail Zaidenberg

We prove an $l^p$ decoupling inequality for hypersurfaces with nonzero Gaussian curvature and use it to derive a corresponding $l^p$ decoupling for curves not contained in a hyperplane. This extends our earlier work from [2]

Classical Analysis and ODEs · Mathematics 2014-07-02 Jean Bourgain , Ciprian Demeter