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200 papers

We study the global structure of moduli spaces of quasi-isogenies of p-divisible groups introduced by Rapoport and Zink. We determine their dimensions and their sets of connected components and of irreducible components. If the isocrystals…

Algebraic Geometry · Mathematics 2007-05-23 Eva Viehmann

An open (resp., closed) subset A of a topological space (X, T ) is called C-open (resp., C-closed) set if cl(A) \ A (resp., A \ int(A)) is a countable set. This paper aims to present the concept of C-open and C-closed sets. We first…

General Topology · Mathematics 2023-05-08 M. H. Alqahtani

The classifying spaces of cobordisms of singular maps have two fairly different constructions. We expose a homotopy theoretical connection between them. As a corollary we show that the classifying spaces in some cases have a simple product…

Geometric Topology · Mathematics 2019-02-27 András Szűcs , Tamás Terpai

We study an analogue of the Parovicenko property in categories of compact spaces with additional structures. In particular, we present an internal characterization of this property in the class of compact median spaces.

General Topology · Mathematics 2015-10-20 Wiesław Kubiś , Andrzej Kucharski , Sławomir Turek

In this paper, we present the classification of generalized Wallach spaces and discuss some related problems.

Differential Geometry · Mathematics 2020-05-19 Yu. G. Nikonorov

We consider a problem on the conditions of a compact Lie group G that the loop space of the p-completed classifying space be a p-compact group for a set of primes. In particular, we discuss the classifying spaces BG that are p-compact for…

Algebraic Topology · Mathematics 2009-03-27 Kenshi Ishiguro

A class of Cantor-type spaces and related geometric structures are discussed.

Classical Analysis and ODEs · Mathematics 2007-11-09 Stephen Semmes

The aim of this paper is to introduce the class of ${\cal A}{\cal B}$-sets as the sets that are the intersection of an open and a semi-regular set. Several classes of well-known topological spaces are characterized via the new concept. A…

General Topology · Mathematics 2007-05-23 Julian Dontchev

We survey some recent advances in the homotopy theory of classifying spaces, and homotopical group theory. We focus on the classification of p-compact groups in terms of root data over the p-adic integers, and discuss some of its…

Algebraic Topology · Mathematics 2010-09-02 Jesper Grodal

In this paper, we introduce round and sleek topological spaces and study their properties.

General Topology · Mathematics 2022-10-28 Jitender Singh

We introduce the concept of a topological J-group and determine for many important examples of topological groups if they are topological J-groups or not. Besides other results, we show that the underlying topological space of a pathwise…

Group Theory · Mathematics 2022-09-15 Rafael Dahmen

A ringed finite space is a ringed space whose underlying topological space is finite. The category of ringed finite spaces contains, fully faithfully, the category of finite topological spaces and the category of affine schemes. Any ringed…

Algebraic Geometry · Mathematics 2015-11-20 Fernando Sancho de Salas

The aim of this work is to introduce and study some new types of generalizations of pairwise paralindeloff spaces, pairwise nearly paralindeloff and almost paralindeloff spaces. Some of their characterizations, properties and subsets are…

General Topology · Mathematics 2015-01-05 Hend Bouseliana , Adem Kilicman

The aim of this paper is to introduce the concept of Delta-Compact spaces along with some basic properties of it. Here, we try to establish the behavior of Delta-Compact spaces under the continuous mapping. Finally, we define another…

General Topology · Mathematics 2023-04-17 Sanjay Roy , Srabani Mondal , Shrobana Sinha Roy , Bobi Mandal

These expository notes are dedicated to the study of the topology of configuration spaces of manifolds. We give detailed computations of many invariants, including the fundamental group of the configuration spaces of $\mathbb{R}^2$, the…

Algebraic Topology · Mathematics 2018-03-30 Ben Knudsen

We give a definition of compactness in L-fuzzy topological spaces and provide a characterization of compact L-fuzzy topological spaces, where L is a complete quasi-monoidal lattice with some additional structures, and we present a version…

General Topology · Mathematics 2010-10-26 Joaquin Luna-Torres , Elias Salazar-Buelvas

Let $X$ be a space. A space $Y$ is called an extension of $X$ if $Y$ contains $X$ as a dense subspace. For an extension $Y$ of $X$ the subspace $Y\backslash X$ of $Y$ is called the remainder of $Y$. Two extensions of $X$ are said to be…

General Topology · Mathematics 2012-07-26 M. R. Koushesh

In this paper, the concept of balanced manifolds is generalized to reduced complex spaces: the class B and balanced spaces. Compared with the case of Kahlerian, the class B is similar to the Fujiki class C and the balanced space is similar…

Complex Variables · Mathematics 2021-01-07 Jixiang Fu , Lingxu Meng , Wei Xia

We deal with topological spaces homeomorphic to their respective squares. Primarily, we investigate the existence of large families of such spaces in some subclasses of compact metrizable spaces. As our main result we show that there is a…

General Topology · Mathematics 2024-01-17 Jan Dudák , Benjamin Vejnar

We study the topology of a class of proper submodules and some of its distinguished subclasses and call them structure spaces. We give several criteria for the quasi-compactness of these structure spaces. We study $T_0$ and $T_1$ separation…

Rings and Algebras · Mathematics 2023-04-18 Amartya Goswami