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In this article we give a survey on open problems and conjectures concerning L^2-invariants. We cover the whole portfolio and not only certain aspects as they are considered in the previous more specialized (and within their scope more…

Algebraic Topology · Mathematics 2023-11-30 Dominik Kirstein , Christian Kremer , Wolfgang Lueck

We collect a number of open questions concerning Diophantine equations, Diophantine Approximation and transcendental numbers. Revised version: corrected typos and added references.

Number Theory · Mathematics 2007-05-23 Michel Waldschmidt

This celebratory article contains a personal and idiosyncratic selection of a few open problems in discrete probability theory. These include certain well known questions concerning Lorentz scatterers and self-avoiding walks, and also some…

Probability · Mathematics 2022-05-17 Geoffrey R. Grimmett

Some Open Problems Concerning Orthogonal Polynomials.

Classical Analysis and ODEs · Mathematics 2016-12-06 Gökalp Alpan , Alexander Goncharov

We prove some extensions of Andrews inequality.

Differential Geometry · Mathematics 2020-11-02 Hao Fang , Biao Ma , Wei Wei

In this notes we show how a problem regarding continued fractions of rational numbers, lead to several phenomena in number theory and dynamics, and eventually to the problem of shearing of divergent diagonal orbits in the space of adelic…

Dynamical Systems · Mathematics 2019-09-04 Ofir David

We provide a simple proof for the union-closed sets conjecture, a long-standing open problem in set theory with immediate applications to graph theory, number theory, and order-theory.

Combinatorics · Mathematics 2016-07-08 Sven Schäge

Several open problems in algebraic logic are solved.

Logic · Mathematics 2013-04-05 Tarek Sayed Ahmed

In this article, we discuss and survey the recent progress towards the Schottky problem, and make some comments on the relations between the Andr{\'e}-Oort conjecture, Okounkov convex bodies, Coleman's conjecture, stable modular forms,…

Algebraic Geometry · Mathematics 2024-01-04 Jae-Hyun Yang

In this small note we ask several questions which are relevant to the construction of the self-consistent neutrino theory of light. The previous confusions in such attempts are explained in the more detailed publication.

High Energy Physics - Theory · Physics 2007-05-23 Valeri V. Dvoeglazov

In this short note we show that both generalizations of celebrated Erd\H{o}s--Ko--Rado theorem and Hilton--Milner theorem to the setting of exterior algebra in the simplest non-trivial case of two-forms follow from the folklore puzzle about…

Combinatorics · Mathematics 2022-01-27 Grigory Ivanov , Seyda Köse

This note imparts heuristic arguments and theorectical evidences that contradict the abc conjecture over the rational numbers. In addition, the rudimentary datails for transforming this problem into the doimain of equidistribution theory…

Number Theory · Mathematics 2007-05-23 N. A. Carella

This paper collects some problems that I have encountered during the years, have puzzled me and which, to the best of my knowledge, are still open. Most of them are well-known and have been first stated by other authors. In this sad season…

Analysis of PDEs · Mathematics 2020-03-26 Giovanni Alessandrini

In this paper, we prove the conjecture that if there is an odd perfect number, then there are infinitely many of them.

Number Theory · Mathematics 2022-02-10 Jose Arnaldo Bebita Dris

We attempt to survey recent results and open problems connected to Lieb-Thirring inequalities.

Mathematical Physics · Physics 2020-07-21 Rupert L. Frank

This paper is an extension program of the notion of circle of partition developed in our first paper \cite{CoP}. As an application we prove the Erd\H{o}s-Tur\'{a}n additive base conjecture.

Number Theory · Mathematics 2024-03-12 Theophilus Agama

These notes are designed to offer some (perhaps new) codicils to related work, a list of problems and conjectures seeking (preferably) combinatorial proofs. The main items are Eulerian polynomials and hook/contents of Young diagram, mostly…

Representation Theory · Mathematics 2022-08-26 Tewodros Amdeberhan

We present some new lower bound estimates for certain numbers in Laver table theory and introduce several related structures of interest.

Logic · Mathematics 2025-11-18 Renrui Qi

We discuss some challenging open problems in the geometric control theory and sub-Riemannian geometry.

Optimization and Control · Mathematics 2013-04-15 Andrei Agrachev

In this note we refine the alternativity in some bifurcation theorems of Rabinowitz type, and then improve a few of results in Lu (2022) [17].

Functional Analysis · Mathematics 2023-09-13 Guangcun Lu