arXiv research

The study examines conditions for minimal volume entropy of simplicial complexes.

Minimal volume entropy vanishes or is positive under certain fiber growth conditions.

This is an expository introduction to simplicial sets and simplicial homotopy theory with particular focus on relating the combinatorial aspects of the theory to their geometric/topological origins. It is intended to be accessible to students familiar with just the fundamentals of algebraic topology.

We analyze oversquashing in topological message-passing using relational structures.

A new clustering method for simplicial complexes using homology.

Proposes a probabilistic framework for stationary topological signals on simplicial complexes.

Alexander's conjecture extended to infinite simplicial complexes.

This paper proposes a new method for learning covers of geometric datasets to improve topological inference and visualization.

Minimal simplicial maps constructed for spheres and manifolds.

Study of $p$-adic simplicial volumes and their properties.

Finite simplicial complexes dominate certain manifolds with a bounded number of simplices.

Simplicial neural networks extend graph neural networks to handle higher-order interactions.

Branched covers are applied frequently in topology - most prominently in the construction of closed oriented PL d-manifolds. In particular, strong bounds for the number of sheets and the topology of the branching set are known for dimension d<=4. On the other hand, Izmestiev and Joswig described how to obtain a simplic…

Detect anomalies in complex networks using topological subspace detectors.

The paper studies geometric embeddings of arc graphs and their rigidity.

TopoNTK kernel captures higher-order interactions in simplicial complexes.

In this paper, we study face vectors of simplicial posets that are the face posets of cell decompositions of topological manifolds without boundary. We characterize all possible face vectors of simplicial posets whose geometric realizations are homeomorphic to the product of spheres. As a corollary, we obtain the chara…

New Markov chains defined on simplicial complexes for understanding their topology.

Constructs a simplicial cell decomposition of complex projective space for n ≥ 2.

The paper surveys some new results and open problems connected with such fundamental combinatorial concepts as polytopes, simplicial complexes, cubical complexes, and subspace arrangements. Particular attention is paid to the case of simplicial and cubical subdivisions of manifolds and, especially, spheres. We describe…

Solved Cheeger inequalities for simplicial complexes, combining topological and graph theoretic methods.

We consider a finite simplicial complex $K$ together with its successive barycentric subdivisions $Sd^d(K), d\geq0,$ and study the expected topology of a random subcomplex in $Sd^d(K), d\gg0$. We get asymptotic upper and lower bounds for the expected Betti numbers of those subcomplexes, together with the average Morse …

The simplicial volume introduced by Gromov provides a topologically accessible lower bound for the minimal volume. Lafont and Schmidt proved that the simplicial volume of closed, locally symmetric spaces of non-compact type is positive. In this paper, we present a generalization of this result to certain non-compact lo…

Constructs algorithms to recognize and classify 2D surfaces.

Efficiently sparsifies simplicial complexes using local densities of states.

The paper shows how to simplify complex optimization problems into simpler ones.

In the third part of this series of papers, we establish several topological results that will become important for studying the long-time behavior of Ricci flows with surgery. In the first part of this paper we recall some elementary observations in the topology of 3-manifolds. The main part is devoted to the construc…

Paper proves Gromov's conjecture on manifolds with certain group properties.

Proposes a method to learn representations of higher-dimensional simplicial complexes.

Study shows complete affine manifolds have zero simplicial volume.

New topological restrictions found for spaces with nonnegative Ricci curvature.

New simplicial complexes show unavoidable link of spheres in high dimensions.

We study the multiscale simplicial flat norm (MSFN) problem, which computes flat norm at various scales of sets defined as oriented subcomplexes of finite simplicial complexes in arbitrary dimensions. We show that the multiscale simplicial flat norm is NP-complete when homology is defined over integers. We cast the mul…

We utilize the obstruction theory of Galewski-Matumoto-Stern to derive equivalent formulations of the Triangulation Conjecture. For example, every closed topological manifold M^n with n > 4 can be simplicially triangulated if and only if the two distinct combinatorial triangulations of RP^5 are simplicially concordant.

We extend the edge version of the classical Menger's Theorem for undirected graphs to $n$-dimensional simplicial complexes with chains over the field $\mathbb{F}_2$. The classical Menger's Theorem states that two different vertices in an undirected graph can be connected by $k$ pairwise edge-disjoint paths if, and only…

Strong regulations in the financial industry mean that any decisions based on machine learning need to be explained. This precludes the use of powerful supervised techniques such as neural networks. In this study we propose a new unsupervised and semi-supervised technique known as the topological hierarchical decomposi…

In the spirit of topological entropy we introduce new complexity functions for general dynamical systems (namely groups and semigroups acting on closed manifolds) but with an emphasis on the dynamics induced on simplicial complexes. For expansive systems remarkable properties are observed. Known examples are revisited …

An algorithm preserves topological features in dimensionality reduction.

Characterizes simplicial complexes embedding into spheres with few vertices.

We describe the moduli space of extensions in the model category of simplicial presheaves. This article can be seen as a generalization of Blomgren-Chacholski results in the case of simplicial sets. Our description of the moduli space of extensions treat the equivariant and the nonequivariant case in the same setting. …

The paper constructs simplicial maps of any degree on spheres, solving a long-standing problem.

A notion of up and down Grover walks on simplicial complexes are proposed and their properties are investigated. These are abstract Szegedy walks, which is a special kind of unitary operators on a Hilbert space. The operators introduced in the present paper are usual Grover walks on graphs defined by using combinatoria…

A good cover in R^d is a collection of open contractible sets in R^d such that the intersection of any subcollection is either contractible or empty. Motivated by an analogy with convex sets, intersection patterns of good covers were studied intensively. Our main result is that intersection patterns of good covers are …

We develop a tighter implementation of basic PL topology, which keeps track of some combinatorial structure beyond PL homeomorphism type. With this technique we clarify some aspects of PL transversality and give combinatorial proofs of a number of known results. New results include a combinatorial characterization of c…

Develops a new neural spike train decoding framework using topological data.

S. Parsa proved embedding conditions for simplicial joins.

Measure homology was introduced by Thurston in his notes about the geometry and topology of 3-manifolds, where it was exploited in the computation of the simplicial volume of hyperbolic manifolds. Zastrow and Hansen independently proved that there exists a canonical isomorphism between measure homology and singular hom…

Study on scalar curvature bounds and manifold topological complexity.