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This work briefly explores the possibility of approximating spatial distance (alternatively, similarity) between data points using the Isolation Forest method envisioned for outlier detection. The logic is similar to that of isolation: the…

Machine Learning · Statistics 2019-11-26 David Cortes

In a previous work, we have associated a complete differential graded Lie algebra to any finite simplicial complex in a functorial way. Similarly, we have also a realization functor from the category of complete differential graded Lie…

Algebraic Topology · Mathematics 2018-01-08 Urtzi Buijs , Yves Félix , Aniceto Murillo , Daniel Tanré

In this article we provide lower bounds for the lower Hausdorff dimension of finite measures assuming certain restrictions on their quaternionic spherical harmonics expansion. This estimate is an analog of a result previously obtained by…

Analysis of PDEs · Mathematics 2022-11-24 Rami Ayoush , Michał Wojciechowski

Answering a question about triangle inequality suggested by R. Li, A. Barrlund introduced a distance function which is a metric on a subdomain of ${\mathbb R}^n\,.$ We study this Barrlund metric and give sharp bounds for it in terms of…

Complex Variables · Mathematics 2024-05-28 Masayo Fujimura , Marcelina Mocanu , Matti Vuorinen

We construct a distance on the moduli space of symplectic toric manifolds of dimension four. Then we study some basic topological properties of this space, in particular, path-connectedness, compactness, and completeness. The construction…

Symplectic Geometry · Mathematics 2016-11-03 Álvaro Pelayo , Ana Rita Pires , Tudor S. Ratiu , Silvia Sabatini

In this paper, a metric on $S_b$-metric space analogous to the Hausdorff metric has been introduced and some basic properties are obtained on multi-valued $S_b$-metric space. Further, the fundamental multi-valued contraction of Nadler(1962)…

Functional Analysis · Mathematics 2023-03-07 Jayanta Sarkar , Megha Pandey , Tanmoy Som , B. S. Choudhury

The Hausdorff distance is a fundamental measure for comparing sets of vectors, widely used in database theory and geometric algorithms. However, its exact computation is computationally expensive, often making it impractical for large-scale…

Databases · Computer Science 2025-03-11 Dongfang Zhao

In this paper, we use algorithmic tools, effective dimension and Kolmogorov complexity, to study the fractal dimension of distance sets. We show that, for any analytic set $E\subseteq\R^2$ of Hausdorff dimension strictly greater than one,…

Computational Complexity · Computer Science 2022-08-16 D. M. Stull

Using the random complexes of Linial and Meshulam, we exhibit a large family of simplicial complexes for which, whenever affinely embedded into Euclidean space, the filling areas of simplicial cycles is greatly distorted. This phenomenon…

Metric Geometry · Mathematics 2014-10-29 Dominic Dotterrer

A theory of sections of simplicial height functions is developed. At the core of this theory lies the section complex, which is assembled from higher section spaces. The latter encode flow lines along the height, as well as their…

Algebraic Topology · Mathematics 2022-02-01 Melvin Vaupel , Erik Hermansen , Paul Trygsland

In this paper we define and study for a finite partially ordered set P a class of simplicial complexes on the set P_r of r-element multichains from P. The simplicial complexes depend on a strictly monotone function from [r] to [2r]. We show…

Combinatorics · Mathematics 2021-09-07 Shaheen Nazir , Volkmar Welker

We introduce a proximal subdifferential and develop a calculus for nonsmooth functions defined on any Riemannian manifold $M$. We give several applications of this theory, concerning: 1) differentiability and geometrical properties of the…

Differential Geometry · Mathematics 2007-05-23 Daniel Azagra , Juan Ferrera

We develop the geometry of Hurwitz continued fractions, a major tool in understanding the approximation properties of complex numbers by ratios of Gaussian integers. Based on a thorough study of the geometric properties of Hurwitz continued…

Number Theory · Mathematics 2025-02-20 Yann Bugeaud , Gerardo Gonzalez Robert , Mumtaz Hussain

In this paper we exploit the concept of extended Pareto grid to study the geometric properties of the matching distance for $\mathbb{R}^2$-valued regular functions defined on a Riemannian closed manifold. In particular, we prove that in…

Algebraic Topology · Mathematics 2023-12-08 Marc Ethier , Patrizio Frosini , Nicola Quercioli , Francesca Tombari

Let $M$ be a smooth manifold and $K\subset M$ be a simplicial complex of codimension at least 3. Functor calculus methods lead to a homotopical formula of $M\setminus K$ in terms of spaces $M\setminus T$ where $T$ is a finite subset of $K$.…

Algebraic Topology · Mathematics 2019-05-29 Steffen Tillmann

Distance matrices are matrices whose elements are the relative distances between points located on a certain manifold. In all cases considered here all their eigenvalues except one are non-positive. When the points are uncorrelated and…

Chaotic Dynamics · Physics 2009-11-10 E. Bogomolny , O. Bohigas , C. Schmit

For a simplicial complex K on m vertices and simplicial complexes K1,...,Km a composed simplicial complex K(K1,...,Km) is introduced. This construction generalizes an iterated simplicial wedge construction studied by A. Bahri, M. Bendersky,…

Combinatorics · Mathematics 2015-05-08 Ayzenberg Anton

In the present paper we calculate the Gromov-Hausdorff distance between an arbitrary simplex (a metric space all whose non-zero distances are the same) and a finite metric space whose non-zero distances take two distinct values (so-called…

Metric Geometry · Mathematics 2019-07-24 A. O. Ivanov , A. A. Tuzhilin

We show how to represent a simple polygon $P$ by a grid (pixel-based) polygon $Q$ that is simple and whose Hausdorff or Fr\'echet distance to $P$ is small. For any simple polygon $P$, a grid polygon exists with constant Hausdorff distance…

Computational Geometry · Computer Science 2016-06-22 Quirijn W. Bouts , Irina Kostitsyna , Marc van Kreveld , Wouter Meulemans , Willem Sonke , Kevin Verbeek

We define two notions of discrete dimension based on the Minkowski and Hausdorff dimensions in the continuous setting. After proving some basic results illustrating these definitions, we apply this machinery to the study of connections…

Combinatorics · Mathematics 2007-07-10 Alex Iosevich , Misha Rudnev , Ignacio Uriarte-Tuero