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This paper investigates the quadratic irrationals that arise as periodic points of the Gauss type shift associated to the odd continued fraction expansion. It is shown that these numbers, which we call O-reduced, when ordered by the length…

Number Theory · Mathematics 2022-03-03 Maria Siskaki

The first and second representation theorems for sign-indefinite, not necessarily semi-bounded quadratic forms are revisited. New straightforward proofs of these theorems are given. A number of necessary and sufficient conditions ensuring…

Functional Analysis · Mathematics 2012-06-15 Luka Grubisic , Vadim Kostrykin , Konstantin A. Makarov , Kresimir Veselic

It has been established on many occasions that the set of quotients of prime numbers is dense in the set of positive real numbers. More recently, it has been proved that the set of quotients of primes in the Gaussian integers is dense in…

Number Theory · Mathematics 2018-07-31 Brian D. Sittinger

We show that for any $\varepsilon > 0$ and a sufficiently large cube-free $q$, any reduced residue class modulo $q$ can be represented as a product of $14$ integers from the interval $[1, q^{1/4e^{1/2} + \varepsilon}]$. The length of the…

Number Theory · Mathematics 2015-05-26 Glyn Harman , Igor E. Shparlinski

In this paper, we obtain several new classes of irreducible polynomials having integer coefficients whose zeros lie inside an open disk around the origin or outside a closed annular region in the complex plane. Such irreducible polynomials…

Number Theory · Mathematics 2023-11-28 Jitender Singh , Sanjeev Kumar

Every finite-dimensional representation of an algebraic group G gives a trace symmetric bilinear form on the Lie algebra of G. We give criteria in terms of root system data for the existence of a representation such that this form is…

Representation Theory · Mathematics 2010-02-17 Skip Garibaldi , Alexander Premet

In this paper, we construct certain infinite families of imaginary quadratic fields whose class number is divisible by a given positive integer.

Number Theory · Mathematics 2012-12-11 Akiko Ito

Chebyshev was the first to observe a bias in the distribution of primes in residue classes. The general phenomenon is that if $a$ is a nonsquare\mod q and $b$ is a square\mod q, then there tend to be more primes congruent to $a\mod q$ than…

Number Theory · Mathematics 2011-07-25 Daniel Fiorilli , Greg Martin

Algebraic integers in totally imaginary quartic number fields are not discrete in the complex plane under a fixed embedding, which makes it impossible to visualize all integers in the plane, unlike the quadratic imaginary algebraic…

Number Theory · Mathematics 2012-09-04 Wenhan Wang

A positive definite integral quadratic form is said to be almost (primitively) universal if it (primitively) represents all but at most finitely many positive integers. In general, almost primitive universality is a stronger property than…

Number Theory · Mathematics 2020-05-25 A. G. Earnest , B. L. K. Gunawardana

In this paper we study the problem of long gaps between values of binary quadratic forms. Let $D_{1}$, $D_{2},\ldots ,D_{r}$ be negative integers and $(s_{n})_{n=1}^{\infty}$ be the sequence of all the numbers representable by any binary…

Number Theory · Mathematics 2025-09-22 Błażej Żmija

We study some properties of quadratic forms with values in a field whose underlying vector spaces are endowed with the structure of right vector spaces over a division ring extension of that field. Some generalized notions of isotropy,…

Rings and Algebras · Mathematics 2019-06-18 Amir Hossein Nokhodkar

Quadratic irrationals posses a periodic continued fraction expansion. Much less is known about cubic irrationals. We do not even know if the partial quotients are bounded, even though extensive computations suggest they might follow…

Number Theory · Mathematics 2014-06-04 M. Lakner , P. Petek , M. Škapin Rugelj

We recall the notion of nearest integer continued fractions over the Euclidean imaginary quadratic fields $K$ and characterize the "badly approximable" numbers, ($z$ such that there is a $C(z)>0$ with $|z-p/q|\geq C/|q|^2$ for all $p/q\in…

Number Theory · Mathematics 2018-09-21 Robert Hines

In this paper, we deal with the problem of bisecting binomial coefficients. We find many (previously unknown) infinite classes of integers which admit nontrivial bisections, and a class with only trivial bisections. As a byproduct of this…

Combinatorics · Mathematics 2016-10-10 Eugen J. Ionascu , Thor Martinsen , Pantelimon Stanica

We study the bias of classical quantile regression and instrumental variable quantile regression estimators. While being asymptotically first-order unbiased, these estimators can have non-negligible second-order biases. We derive a…

Econometrics · Economics 2025-12-17 Grigory Franguridi , Bulat Gafarov , Kaspar Wuthrich

We prove the existence of secondary terms of order $X^{5/6}$ in the asymptotic formulas for the average size of the genus number of cubic fields and for the number of cubic fields with a given genus number, establishing improved error…

Number Theory · Mathematics 2026-02-04 Tatsuya Yamada

We start with observing that the only connected finite dimensional algebras with finitely many isomorphism classes of indecomposable bimodules are the quotients of the path algebras of uniformly oriented $A_n$-quivers modulo the radical…

Representation Theory · Mathematics 2020-10-21 Volodymyr Mazorchuk , Xiaoting Zhang

It is shown that the sum of class numbers of orders in totally complex quartic fields with no real quadratic subfield obeys an asymptotic law similar to the prime numbers, as the bound on the regulators tends to infinity. Here only orders…

Number Theory · Mathematics 2007-05-23 Mark Pavey

Understanding the distribution of digits in the expansions of perfect powers in different bases is difficult. Rather than consider the asymptotic digit distributions, we consider the base-10 digits of a restricted sequence of powers of two.…

Number Theory · Mathematics 2019-06-04 David Wu