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A locally compact group G is said to be Hermitian if every selfadjoint element of L^1(G) has real spectrum. Using Halmos' notion of capacity in Banach algebras and a result of Jenkins, Fountain, Ramsay and Williamson we will put a bound on…

Functional Analysis · Mathematics 2013-05-28 Rui Palma

We study the restricted growth function associated with set partitions, and obtain exact formulas for the number of strong records with height one, the total of record heights over set of partitions, and the number of partitions with a…

Combinatorics · Mathematics 2019-08-05 Toufik Mansour , Reza Rastegar , Alexander Roitershtein

We prove that a set $A$ of at most $q$ non-collinear points in the finite plane $\mathbb{F}_{q}^{2}$ spans at least $\approx\frac{|A|}{\sqrt{q}}$ directions: this is based on a lower bound contained in [FST13], which we prove again together…

Combinatorics · Mathematics 2022-12-13 Daniele Dona

We study the growth of Laplacian eigenfunctions $ -\Delta \phi_k = \lambda_k \phi_k$ on compact manifolds $(M,g)$. H\"ormander proved sharp polynomial bounds on $\| \phi_k\|_{L^{\infty}}$ which are attained on the sphere. On a `generic'…

Spectral Theory · Mathematics 2021-11-25 Stefan Steinerberger

In the research, with aid of the Fa\`a di Bruno formula, be virtue of several identities for the Bell polynomials of the second kind, with help of two combinatorial identities, by means of the (logarithmically) complete monotonicity of…

Combinatorics · Mathematics 2024-07-30 Feng Qi

We use tools of additive combinatorics for the study of subvarieties defined by {\it high rank} families of polynomials in high dimensional $\mathbb{F} _q$-vector spaces. In the first, analytic part of the paper we prove a number properties…

Algebraic Geometry · Mathematics 2020-07-20 David Kazhdan , Tamar Ziegler

The goal of this paper is to obtain lower bounds on the height of an algebraic number in a relative setting, extending previous work of Amoroso and Masser. Specifically, in our first theorem we obtain an effective bound for the height of an…

Number Theory · Mathematics 2017-04-12 Shabnam Akhtari , Kevser Aktaş , Kirsti Biggs , Alia Hamieh , Kathleen Petersen , Lola Thompson

Let $X\subset\mathbb{R}^n$ be a convex closed and semialgebraic set and let $f$ be a polynomial positive on $X$. We prove that there exists an exponent $N\geq 1$, such that for any $\xi\in\mathbb{R}^n$ the function…

Algebraic Geometry · Mathematics 2018-12-13 Krzysztof Kurdyka , Katarzyna Kuta , Stanisław Spodzieja

The HRT (Heil-Ramanathan-Topiwala) conjecture asks whether a finite collection of time-frequency shifts of a non-zero square integrable function on $\mathbb{R}$ is linearly independent. This longstanding conjecture remains largely open even…

Classical Analysis and ODEs · Mathematics 2018-12-21 Kasso A. Okoudjou

Recently, R\'emond stated a very general conjecture on lower bounds of a normalized height on either an abelian variety or a power of the multiplicative group. In this note, we extend a particular case of this conjecture to split…

Number Theory · Mathematics 2022-07-01 Arnaud Plessis

The main purpose of this paper is to prove that the positive real numbers can be decomposed into finitely many disjoint pieces which are also closed under addition and multiplication. As a byproduct of the argument we determine all the…

Number Theory · Mathematics 2023-03-30 Gergely Kiss , Gábor Somlai , Tamás Terpai

I prove several theorems concerning upward closure and amalgamation in the generic multiverse of a countable transitive model of set theory. Every such model $W$ has forcing extensions $W[c]$ and $W[d]$ by adding a Cohen real, which cannot…

Logic · Mathematics 2015-11-04 Joel David Hamkins

We give very precise bounds for the congruence subgroup growth of arithmetic groups. This allows us to determine the subgroup growth of irreducible lattices of semisimple Lie groups. In the most general case our results depend on the…

Group Theory · Mathematics 2007-05-23 A. Lubotzky , N. Nikolov

A differential version of the classical Weil descent is established in all characteristics. It yields a theory of differential restriction of scalars for differential varieties over finite differential field extensions. This theory is then…

Algebraic Geometry · Mathematics 2018-07-31 Omar León Sánchez , Marcus Tressl

The purpose of the article is to provide partial proofs for two conjectures given by Witte and Forrester in "Moments of the Gaussian $\beta$ Ensembles and the large $N$ expansion of the densities" with the use of the topological recursion…

Mathematical Physics · Physics 2015-06-19 Olivier Marchal

We study the topological, dynamical, and descriptive set theoretic properties of Hurwitz continued fractions. Hurwitz continued fractions associate an infinite sequence of Gaussian integers to every complex number which is not a Gaussian…

Number Theory · Mathematics 2025-01-30 Felipe García-Ramos , Gerardo González Robert , Mumtaz Hussain

We show that for a large class of finite groups G, the number of Galois extensions E/Q of group G and discriminant $|d_E|\leq y$ grows like a power of $y$ (for some specified exponent). The groups G are the regular Galois groups over Q and…

Number Theory · Mathematics 2014-04-17 Pierre Dèbes

Let \phi be a first order formula and M be a countable model. \phi^M denotes the set of all assignments that satisfy \phi in M. Let M, N be countable models. A formula \phi distinguishes these models if |\phi^M|\neq |\phi^N|. We show that…

Logic · Mathematics 2013-04-04 Mohammed Assem , Tarek Sayed Ahmed

We prove the discrete analogue of Kakeya conjecture over $\mathbb{R}^n$. This result suggests that a (hypothetically) low dimensional Kakeya set cannot be constructed directly from discrete configurations. We also prove a generalization…

Combinatorics · Mathematics 2014-09-04 Ruixiang Zhang

We study the asymptotic growth of coefficients of Mahler power series with algebraic coefficients, as measured by their logarithmic Weil height. We show that there are five different growth behaviors, all of which being reached. Thus, there…

Number Theory · Mathematics 2026-01-13 Boris Adamczewski , Jason Bell , Daniel Smertnig
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