General topology | Compactness (mathematics) | Mathematical analysis

Exhaustion by compact sets

In mathematics, especially general topology and analysis, an exhaustion by compact sets of a topological space is a nested sequence of compact subsets of (i.e. ), such that is contained in the interior of , i.e. for each and . A space admitting an exhaustion by compact sets is called exhaustible by compact sets. For example, consider and the sequence of closed balls . Occasionally some authors drop the requirement that is in the interior of , but then the property becomes the same as the space being σ-compact, namely a countable union of compact subsets. (Wikipedia).

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Math 101 Fall 2017 112917 Introduction to Compact Sets

Definition of an open cover. Definition of a compact set (in the real numbers). Examples and non-examples. Properties of compact sets: compact sets are bounded. Compact sets are closed. Closed subsets of compact sets are compact. Infinite subsets of compact sets have accumulation poi

From playlist Course 6: Introduction to Analysis (Fall 2017)

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Math 101 Introduction to Analysis 112515: Introduction to Compact Sets

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From playlist Course 6: Introduction to Analysis

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Math 101 Introduction to Analysis 113015: Compact Sets, ct'd

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From playlist Course 6: Introduction to Analysis

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Every Compact Set in n space is Bounded

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From playlist Advanced Calculus

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Proof by Exhaustion

Ben discusses proof by exhaustion and goes through some examples.

From playlist Basics: Proofs

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From playlist Course 7: (Rudin's) Principles of Mathematical Analysis

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Properties of Compactness

Compact sets enjoy some mysterious properties, which I'll discuss in this video. More precisely, compact sets are always bounded and closed. The beauty of this result lies in the proof, which is an elegant application of this subtle concept. Enjoy! Compactness Definition: https://youtu.be

From playlist Topology

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More resources available at www.misterwootube.com

From playlist The Nature of Proof

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From playlist Mathematics

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From playlist Mathematics

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New Methods in Finsler Geometry - 23 May 2018

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From playlist Centro di Ricerca Matematica Ennio De Giorgi

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Automorphic Cohomology II (Carayol's Work and an Application) - Phillip Griffiths

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From playlist Mathematics

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From playlist IIT Bombay: Aerospace - Jet Aircraft Propulsion (CosmoLearning Aerospace Engineering)

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From playlist Mathematics

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Hilbert Space Techniques in Complex Analysis and Geometry (Lecture 7) by Dror Varolin

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From playlist Cauchy-Riemann Equations in Higher Dimensions 2019

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From playlist Not Only Scalar Curvature Seminar

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Why is the Empty Set a Subset of Every Set? | Set Theory, Subsets, Subset Definition

The empty set is a very cool and important part of set theory in mathematics. The empty set contains no elements and is denoted { } or with the empty set symbol ∅. As a result of the empty set having no elements is that it is a subset of every set. But why is that? We go over that in this

From playlist Set Theory

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Hilbert Space Techniques in Complex Analysis and Geometry (Lecture 5) by Dror Varolin

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From playlist Cauchy-Riemann Equations in Higher Dimensions 2019

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This video is about compactness and some of its basic properties.

From playlist Basics: Topology

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2022 10 Dan Coman: Extension of quasiplurisubharmonic functions

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From playlist Analysis and its Applications

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