Equivalence (mathematics) | Homological algebra | Algebraic topology

Quasi-isomorphism

In homological algebra, a branch of mathematics, a quasi-isomorphism or quism is a morphism A → B of chain complexes (respectively, cochain complexes) such that the induced morphisms of homology groups (respectively, of cohomology groups) are isomorphisms for all n. In the theory of model categories, quasi-isomorphisms are sometimes used as the class of weak equivalences when the objects of the category are chain or cochain complexes. This results in a homology-local theory, in the sense of Bousfield localization in homotopy theory. (Wikipedia).

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Group Isomorphisms in Abstract Algebra

Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys Group Isomorphisms in Abstract Algebra - Definition of a group isomorphism and isomorphic groups - Example of proving a function is an Isomorphism, showing the group of real numbers under addition is isomorphic to the group of posit

From playlist Abstract Algebra

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Isomorphisms in abstract algebra

In this video I take a look at an example of a homomorphism that is both onto and one-to-one, i.e both surjective and injection, which makes it a bijection. Such a homomorphism is termed an isomorphism. Through the example, I review the construction of Cayley's tables for integers mod 4

From playlist Abstract algebra

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23 Algebraic system isomorphism

Isomorphic algebraic systems are systems in which there is a mapping from one to the other that is a one-to-one correspondence, with all relations and operations preserved in the correspondence.

From playlist Abstract algebra

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Isomorphisms (Abstract Algebra)

An isomorphism is a homomorphism that is also a bijection. If there is an isomorphism between two groups G and H, then they are equivalent and we say they are "isomorphic." The groups may look different from each other, but their group properties will be the same. Be sure to subscribe s

From playlist Abstract Algebra

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Homomorphisms in abstract algebra

In this video we add some more definition to our toolbox before we go any further in our study into group theory and abstract algebra. The definition at hand is the homomorphism. A homomorphism is a function that maps the elements for one group to another whilst maintaining their structu

From playlist Abstract algebra

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GT9. Group Isomorphisms

Abstract Algebra: In analogy with bijections for sets, we define isomorphisms for groups. We note various properties of group isomorphisms and a method for constructing isomorphisms from onto homomorphisms. We also show that isomorphism is an equivalence relation on the class of groups.

From playlist Abstract Algebra

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Abstract Algebra | Group Isomorphisms

We give the definition of an isomorphism between groups and provide some examples. http://www.michael-penn.net http://www.randolphcollege.edu/mathematics/

From playlist Abstract Algebra

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The Quasimorphism Question - Daniel Anthony Cristofaro-Gardiner

Joint IAS/Princeton University Symplectic Geometry Seminar Topic: The Quasimorphism Question Speaker: Daniel Anthony Cristofaro-Gardiner Affiliation: University of Maryland Date: March 14, 2022 I will discuss a recent work constructing quasimorphisms on the group of area and orientation

From playlist Mathematics

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Lots of group isomorphism examples.

We present several examples of group homomorphisms and isomorphisms applying the first isomorphism theorem. http://www.michael-penn.net http://www.randolphcollege.edu/mathematics/

From playlist Abstract Algebra

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Higher Algebra 5: Slices and filtered colimits

In this video, we provide further properties of the derived category of an abelian category. Along the way we discuss slice categories and filtered colimits. This is the fifth video in our introduction to ∞-categories and Higher Algebra. Feel free to post comments and questions at our pub

From playlist Higher Algebra

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Charles Rezk - 1/4 Higher Topos Theory

Course at the school and conference “Toposes online” (24-30 June 2021): https://aroundtoposes.com/toposesonline/ Slides: https://aroundtoposes.com/wp-content/uploads/2021/07/RezkNotesToposesOnlinePart1.pdf In this series of lectures I will give an introduction to the concept of "infinity

From playlist Toposes online

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Alex Fok, Equvariant twisted KK-theory of noncompact Lie groups

Global Noncommutative Geometry Seminar(Asia-Pacific), Oct. 25, 2021

From playlist Global Noncommutative Geometry Seminar (Asia and Pacific)

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Winter School JTP: Introduction to A-infinity structures, Bernhard Keller, Lecture 3

In this minicourse, we will present basic results on A-infinity algebras, their modules and their derived categories. We will start with two motivating problems from representation theory. Then we will briefly present the topological origin of A-infinity structures. We will then define and

From playlist Winter School on “Connections between representation Winter School on “Connections between representation theory and geometry"

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Monika Kudlinska: Quasi-isometries of Free-by-cyclic Groups

Monika Kudlinska, University of Oxford Title: Quasi-isometries of Free-by-cyclic Groups A group is free-by-cyclic if it admits an epimorphism onto the infinite cyclic group with kernel a free group of finite rank. The study of free-by-cyclic groups is largely motivated by the case of 3-man

From playlist 39th Annual Geometric Topology Workshop (Online), June 6-8, 2022

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Charles Weibel: K-theory of algebraic varieties (Lecture 2)

The lecture was held within the framework of the Hausdorff Trimester Program: K-Theory and Related Fields. Charles Weibel: K theory of algebraic varieties Abstract: Lecture 1 will present definitions for the Waldhausen K-theory of rings, varieties, additive and exact categories, and dg c

From playlist HIM Lectures: Trimester Program "K-Theory and Related Fields"

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Schemes 18: Immersions

This lecture is part of an online algebraic geometry course on schemes, based on chapter II of "Algebraic geometry" by Hartshorne. We define open and closed immersion, and give some basic properties and some examples.

From playlist Algebraic geometry II: Schemes

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Emily Stark: Action rigidity for free products of hyperbolic manifold groups

CIRM VIRTUAL EVENT Recorded during the meeting"Virtual Geometric Group Theory conference " the May 22, 2020 by the Centre International de Rencontres Mathématiques (Marseille, France) Filmmaker: Guillaume Hennenfent Find this video and other talks given by worldwide mathematicians on CIRM

From playlist Virtual Conference

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Étale cohomology - 11/19/2020

Perfect complexes, Lefschetz trace formula with torsion coefficients, intro to the main lemma

From playlist Étale cohomology and the Weil conjectures

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Étale cohomology lecture IV - 9/1/2020

Morphisms of sites, fppf descent part 1

From playlist Étale cohomology and the Weil conjectures

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Abstract Algebra | Properties of isomorphisms.

We prove some important properties of isomorphisms. http://www.michael-penn.net http://www.randolphcollege.edu/mathematics/

From playlist Abstract Algebra

Related pages

Bousfield localization | Homology (mathematics) | Weak equivalence (homotopy theory) | Chain complex | Derived category | Mathematics | Homotopy theory | Homological algebra | Isomorphism | Model category