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Topological properties
Topological properties

... 2.1. Definition and first examples. Probably many of you have seen the notion of compact space in the context of subsets of Rn , as sets which are closed and bounded. Although not obviously at all, this is a topological property (it can be defined using open sets only). Definition 4.14. Given a topo ...
arXiv:1510.01797v3 [math.CT] 21 Apr 2016 - Mathematik, Uni
arXiv:1510.01797v3 [math.CT] 21 Apr 2016 - Mathematik, Uni

Fuzziness in Chang`s Fuzzy Topological Spaces
Fuzziness in Chang`s Fuzzy Topological Spaces

Algebraic models for rational G
Algebraic models for rational G

... where Σ∞ X denotes the suspension spectrum on X and square brackets denote homotopy classes of maps. Therefore we might study cohomology theories by studying the corresponding spectra. What is more, on the level of spectra the information we are interested in is up to homotopy, that is we want to wo ...
Homotopy theories and model categories
Homotopy theories and model categories

Synthetic topology - School of Computer Science, University of
Synthetic topology - School of Computer Science, University of

Scott Topology and its Relation to the Alexandroff Topology
Scott Topology and its Relation to the Alexandroff Topology

Equivariant asymptotic dimension, Damian Sawicki, praca magisterska
Equivariant asymptotic dimension, Damian Sawicki, praca magisterska

arXiv:math/0009100v1 [math.DG] 10 Sep 2000
arXiv:math/0009100v1 [math.DG] 10 Sep 2000

QUOTIENTS OF PROXIMITY SPACES 589
QUOTIENTS OF PROXIMITY SPACES 589

Derived algebraic geometry
Derived algebraic geometry

... of which have the equation x = 0. In this case, the affine ring of the scheme theoretic intersection is given by C[x, y]/(x, x) ' C[y]. This ring has dimension one, rather than the expected dimension zero, because the two equations are not independent: setting x = 0 twice is equivalent to setting x ...
Class Notes for Math 871 - DigitalCommons@University of
Class Notes for Math 871 - DigitalCommons@University of

Topological pullback, covering spaces, and a triad
Topological pullback, covering spaces, and a triad

Lecture notes of Dr. Hicham Gebran
Lecture notes of Dr. Hicham Gebran

... Remark 1.5 A set which is not open is not necessarily closed. For example ]0,1] is neither open nor closed. Also a set can be both open and closed. Indeed, in any metric space X, ∅ and X are closed an open. Here is another example. Let d be the discrete distance on a set X containing more than one p ...
Contents 1. Introduction 2 2. The monoidal background 5 2.1
Contents 1. Introduction 2 2. The monoidal background 5 2.1

... Our main result, theorem 4.3.1, is an acyclic models theorem for monoidal functors from a monoidal category C to the monoidal category C∗ (Z). We likewise establish several variations of this result, which cover the symmetric monoidal and the contravariant monoidal settings. As a consequence of our ...
General Topology - IMJ-PRG
General Topology - IMJ-PRG

Factorization homology of stratified spaces
Factorization homology of stratified spaces

... Remark 0.4. In this work, we use Joyal’s quasi-category model of ∞-category theory [Jo]. Boardman & Vogt first introduced these simplicial sets in [BV], as weak Kan complexes, and their and Joyal’s theory has been developed in great depth by Lurie in [Lu1] and [Lu2], our primary references; see the ...
COMPACTLY GENERATED SPACES Contents 1
COMPACTLY GENERATED SPACES Contents 1

Homotopy theory for beginners - Institut for Matematiske Fag
Homotopy theory for beginners - Institut for Matematiske Fag

Topological vector spaces
Topological vector spaces

... or C × V into V , as appropriate. This uses the product topology on R × V or C × V associated to the standard topology on R or C and the given topology on V . Some authors include the additional condition that {0} be a closed set in V , and we shall follow this convention here as well. Note that a t ...
Galois actions on homotopy groups of algebraic varieties
Galois actions on homotopy groups of algebraic varieties

... as Galois representations, by recovering them from cohomology groups of smooth Weil sheaves, thereby extending the author’s paper [38] from fundamental groups to higher homotopy groups, and indeed to the whole homotopy type. Corollaries 7.4 and 7.36 give similar results for `–adic and p –adic homoto ...
TRACES IN SYMMETRIC MONOIDAL CATEGORIES Contents
TRACES IN SYMMETRIC MONOIDAL CATEGORIES Contents

... Every object of nCob is dualizable: the evaluation and coevaluation are both M ×[0, 1], regarded either as a cobordism from ∅ to M tM or from M tM to ∅. The trace of a cobordism from M to M is the closed n-manifold obtained by gluing the two components of its boundary together. In particular, the Eu ...
The Brauer group of a locally compact groupoid - MUSE
The Brauer group of a locally compact groupoid - MUSE

Universitat Jaume I Departament de Matem` atiques BOUNDED SETS IN TOPOLOGICAL
Universitat Jaume I Departament de Matem` atiques BOUNDED SETS IN TOPOLOGICAL

1 Introduction
1 Introduction

< 1 ... 5 6 7 8 9 10 11 12 13 ... 66 >

Sheaf (mathematics)

In mathematics, a sheaf is a tool for systematically tracking locally defined data attached to the open sets of a topological space. The data can be restricted to smaller open sets, and the data assigned to an open set is equivalent to all collections of compatible data assigned to collections of smaller open sets covering the original one. For example, such data can consist of the rings of continuous or smooth real-valued functions defined on each open set. Sheaves are by design quite general and abstract objects, and their correct definition is rather technical. They exist in several varieties such as sheaves of sets or sheaves of rings, depending on the type of data assigned to open sets.There are also maps (or morphisms) from one sheaf to another; sheaves (of a specific type, such as sheaves of abelian groups) with their morphisms on a fixed topological space form a category. On the other hand, to each continuous map there is associated both a direct image functor, taking sheaves and their morphisms on the domain to sheaves and morphisms on the codomain, and an inverse image functor operating in the opposite direction. These functors, and certain variants of them, are essential parts of sheaf theory.Due to their general nature and versatility, sheaves have several applications in topology and especially in algebraic and differential geometry. First, geometric structures such as that of a differentiable manifold or a scheme can be expressed in terms of a sheaf of rings on the space. In such contexts several geometric constructions such as vector bundles or divisors are naturally specified in terms of sheaves. Second, sheaves provide the framework for a very general cohomology theory, which encompasses also the ""usual"" topological cohomology theories such as singular cohomology. Especially in algebraic geometry and the theory of complex manifolds, sheaf cohomology provides a powerful link between topological and geometric properties of spaces. Sheaves also provide the basis for the theory of D-modules, which provide applications to the theory of differential equations. In addition, generalisations of sheaves to more general settings than topological spaces, such as Grothendieck topology, have provided applications to mathematical logic and number theory.
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