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In the literature, we have various ways of proving irrationality of a real number. In this survey article, we shall emphasize on a particular criterion to prove irrationality. This is called nice approximation of a number by a sequence of…

Number Theory · Mathematics 2022-06-28 Tirthankar Bhattacharyya , Soham Bakshi , Arka Das

We provide an elementary proof of the lower bound for the variance of continuous unimodal distributions and obtain analogous bounds for the higher order central moments. A lower bound for the rth central moment of discrete distribution is…

Statistics Theory · Mathematics 2016-02-16 R. Sharma , R. Bhandari , R. Saini

In recent years, many connections have been made between minimal codes, a classical object in coding theory, and other remarkable structures in finite geometry and combinatorics. One of the main problems related to minimal codes is to give…

Information Theory · Computer Science 2023-02-13 Martin Scotti

The poset of permutations of [n] under Bruhat ordering is studied. We give nontrivial upper and lower bounds for the number of comparable pairs of permutations in both the weak and strong versions of this order. In light of numerical…

Probability · Mathematics 2007-05-23 Adam Hammett , Boris Pittel

Suppose that $M$ is a finitely-generated graded module of codimension $c\geq 3$ over a polynomial ring and that the regularity of $M$ is at most $2a-2$ where $a\geq 2$ is the minimal degree of a first syzygy of $M$. Then we show that the…

Commutative Algebra · Mathematics 2019-10-29 Adam Boocher , Derrick Wigglesworth

We study the number of primes with a given primitive root and in an arithmetic progression under the assumption of a suitable form of the generalized Riemann Hypothesis. Previous work of Lenstra, Moree and Stevenhagen has given asymptotics…

Number Theory · Mathematics 2018-10-16 Michel Zoeteman

This work proposes a proof of the simplest cubic primes counting problem. It shows that the subset of primes {p = n^3 + 2 is prime : n => 1} is an infinite subset of primes. Further, the expected order of magnitude of the cubic primes…

General Mathematics · Mathematics 2013-02-20 N. A. Carella

We study the prime numbers that lie in Beatty sequences of the form $\lfloor \alpha n + \beta \rfloor$ and have prescribed algebraic splitting conditions. We prove that the density of primes in both a fixed Beatty sequence and a Chebotarev…

Number Theory · Mathematics 2019-09-04 Caleb Ji , Joshua Kazdan , Vaughan McDonald

We propose a slight modification of the Berlekamp-Massey Algorithm for obtaining the minimal polynomial of a given linearly recurrent sequence. Such a modification enables to explain it in a simpler way and to adapt it to lazy evaluation.

Data Structures and Algorithms · Computer Science 2025-02-18 Nadia Ben Atti , Gema M. Diaz--Toca , Henri Lombardi

Given a rooted tree and a ranking of its leaves, what is the minimum number of inversions of the leaves that can be attained by ordering the tree? This variation of the problem of counting inversions in arrays originated in mathematical…

Data Structures and Algorithms · Computer Science 2024-07-02 Ivan Hu , Dieter van Melkebeek , Andrew Morgan

Let f(t) be a rational function of degree at least 2 with rational coefficients. For a given rational number x_0, define x_{n+1}=f(x_n) for each nonnegative integer n. If this sequence is not eventually periodic, then the difference…

Number Theory · Mathematics 2011-11-28 Xander Faber , Andrew Granville

We present a new approach to deal with Fraenkel's conjecture, which describes how the integers can be partitioned into sets of rational Beatty sequences, in the case where the numerators of the moduli are equal. We use this approach to give…

Number Theory · Mathematics 2017-09-26 Ofir Schnabel , Jamie Simpson

The summatory function of the number of binomial coefficients not divisible by a prime is known to exhibit regular periodic oscillations, yet identifying the less regularly behaved minimum of the underlying periodic functions has been open…

Number Theory · Mathematics 2024-08-14 Hsien-Kuei Hwang , Svante Janson , Tsung-Hsi Tsai

The goal of this work is to prove a new sure upper bound in a setting that can be thought of as a simplified function field analogue. This result is comparable to a recent result of the author concerning almost sure upper bound of random…

Number Theory · Mathematics 2025-06-18 Rachid Caich

We estimate multiplicative character sums taken on the values of a non-homogeneous Beatty sequence $\{[\alpha n + \beta] : n =1,2,... \}$, where $\alpha,\beta\in\R$, and $\alpha$ is irrational. Our bounds are nontrivial over the same short…

Number Theory · Mathematics 2007-05-23 William D. Banks , Igor E. Shparlinski

We give an exponential lower bound for Berge-Ramsey problems.

Combinatorics · Mathematics 2020-01-23 Dömötör Pálvölgyi

In this note, basing on a certain functional equation of the dilogarithm function, we establish nontrivial lower bounds for the $p$-adic valuation (where $p$ is a given prime number) of some type of rational numbers involving harmonic…

Number Theory · Mathematics 2022-12-08 Bakir Farhi

In this short note, we give two proofs of the infinitude of primes via valuation theory and give a new proof of the divergence of the sum of prime reciprocals by Roth's theorem and Euler-Legendre's theorem for arithmetic progressions.

Number Theory · Mathematics 2018-02-13 Shin-ichiro Seki

Let $\xi$ be a real number and $b \ge 2$ an integer. We study the relationship between the irrationality exponent of $\xi$ and the subword complexity $p(n, \mathbf{x})$ of the $b$-ary expansion $\mathbf{x}$ of $\xi$, where $p(n,…

Number Theory · Mathematics 2026-03-23 Yann Bugeaud , Hajime Kaneko , Dong Han Kim

We investigate some extremal problems in Fourier analysis and their connection to a problem in prime number theory. In particular, we improve the current bounds for the largest possible gap between consecutive primes assuming the Riemann…

Number Theory · Mathematics 2021-08-09 Emanuel Carneiro , Micah B. Milinovich , Kannan Soundararajan