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We present a new scheme of defining invariant observables for general relativistic systems. The scheme is based on the introduction of an observer which endowes the construction with a straightforward physical interpretation. The…

General Relativity and Quantum Cosmology · Physics 2014-05-23 Paweł Duch , Wojciech Kamiński , Jerzy Lewandowski , Jedrzej Świeżewski

In this work we tried to prove the lonely runner conjecture also known as the view obstruction problem.

Discrete Mathematics · Computer Science 2017-12-15 Oleksiy Kurganskyy

This expository paper is concerned with the rationality problems for three-dimensional algebraic varieties with a conic bundle structure. We discuss the main methods of this theory. We sketch the proofs of certain principal results, and…

Algebraic Geometry · Mathematics 2018-09-26 Yuri Prokhorov

An expository approach is given on the relationship between algebraic and geometric approaches to properties of isometries in the plane and the 2-sphere.

Metric Geometry · Mathematics 2014-05-28 John E. Connett

M{\o}ller maps are identifications between the observables of a perturbatively interacting physical system and the observables of its underlying free (i.e. non-interacting) system. This work studies and characterizes obstructions to the…

Mathematical Physics · Physics 2025-11-26 Marco Benini , Alastair Grant-Stuart , Giorgio Musante , Alexander Schenkel

This paper focuses on a new approach to plane geometry and develops important concepts that can allow researchers to unite and observe plane geometry from a new, meaningful perspective.

Metric Geometry · Mathematics 2021-06-10 Alexander Skutin

This is an expository paper about the topics listed in the title.

Algebraic Geometry · Mathematics 2007-10-23 Lucia Caporaso

The paper presents a survey over frame multipliers and related concepts. In particular, it includes a short motivation of why multipliers are of interest to consider, a review as well as extension of recent results, devoted to the…

Functional Analysis · Mathematics 2020-09-11 Diana T. Stoeva , Peter Balazs

This paper will be splited into two papers and submited later.

Geometric Topology · Mathematics 2008-10-27 Fan Ding , Shicheng Wang , Jiangang Yao

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

The phenomenology of jets associated with a variety of black hole systems is summarized, emphasizing the constraints imposed on their origin. Models of jet formation are reviewed, focusing in particular on recent ideas concerning MHD…

Astrophysics · Physics 2009-10-31 Annalisa Celotti , Roger D. Blandford

An expository hitchhikers guide to some theorems in mathematics.

History and Overview · Mathematics 2022-02-07 Oliver Knill

A review article on the physics of beam-beam interactions in circular colliders.

Accelerator Physics · Physics 2011-02-16 Tanaji Sen

This is an expository article for Elsevier's Encyclopedia of Mathematical Physics on the subject in the title. Comments/corrections welcome.

Exactly Solvable and Integrable Systems · Physics 2010-04-19 A. Doliwa , P. M. Santini

We introduce a model detector which registers the passage of a particle through the detector location, without substantially perturbing the particle wave function. (The exact time of passage is not determined in such measurements.) We then…

High Energy Physics - Theory · Physics 2009-09-25 Alexander Vilenkin , Serge Winitzki

In this paper we give some basic results on blocking sets on minimum size for a finite chain geometry.

Combinatorics · Mathematics 2013-04-05 Andrea Blunck , Hans Havlicek , Corrado Zanella

A slip on a paper concerning near-vector spaces is fixed. New characterization of near-vector spaces determined by finite fields is provided and the number (up to the isomorphism) of these spaces is exhibited.

Commutative Algebra · Mathematics 2016-12-12 Kijti Rodtes , Wilasinee Chomjun

In this paper we collect the main properties of free curves in the complex projective plane and a lot of conjectures and open problems, both old and new. In the quest to understand the mystery of free curves, many tools were developed and…

Algebraic Geometry · Mathematics 2023-12-22 Alexandru Dimca

We develop a general theory of spatial solitons in a liquid crystalline medium exhibiting a nonlinearity with an arbitrary degree of effective nonlocality. The model accounts the observability of "accessible solitons" and establishes an…

Optics · Physics 2009-11-10 Claudio Conti , Marco Peccianti , Gaetano Assanto

A short exposition with complete proofs of the theory of cluster expansions for an abstract polymer system is presented.

Statistical Mechanics · Physics 2012-06-19 Salvador Miracle-Sole