{"title":"算子代数的二面同调三性","authors":"","doi":"10.1016/j.sciaf.2024.e02325","DOIUrl":null,"url":null,"abstract":"<div><p>This article delves into algebraic topology, specifically (co)homology theory, which is essential in various mathematical fields. It explores different types of (co)homology groups such as Hochschild, cyclic, reflexive, and dihedral, focusing on dihedral cohomology generated by the dihedral group operating on simplicial complexes. The text discusses when dihedral and reflexive cohomology vanishes and provides examples, along with proving a homomorphism between dihedral cohomology groups. Mathematical concepts like Banach spaces, <span><math><msup><mrow><mi>C</mi></mrow><mo>*</mo></msup></math></span>-algebras, and tensor products are elucidated to understand the algebraic structures involved. Theorems and proofs establish the relationships and properties of these cohomology groups, culminating in a canonical isomorphism theorem for the product of two algebras. Overall, the article aims to provide a comprehensive exploration of dihedral cohomology and its interplay with other algebraic structures, offering insights into its applications and theoretical foundations. Additionally, it studies the (co)homology theory of <span><math><msup><mrow><mi>C</mi></mrow><mo>*</mo></msup></math></span>-algebras, focusing on the triviality of cohomology groups of operator algebras and discovering the canonical isomorphism between any two unital <span><math><mi>K</mi></math></span> -algebras <span><math><mi>A</mi></math></span> and <span><math><mrow><mi>A</mi><msup><mrow></mrow><mo>′</mo></msup></mrow></math></span>: <span><math><mrow><mi>H</mi><msub><mi>D</mi><mi>n</mi></msub><mrow><mo>(</mo><mrow><mi>A</mi><mo>×</mo><msup><mi>A</mi><mo>′</mo></msup></mrow><mo>)</mo></mrow><mo>≅</mo><mi>H</mi><msub><mi>D</mi><mi>n</mi></msub><mrow><mo>(</mo><mi>A</mi><mo>)</mo></mrow><mo>⊕</mo><mi>H</mi><msub><mi>D</mi><mi>n</mi></msub><mrow><mo>(</mo><msup><mi>A</mi><mo>′</mo></msup><mo>)</mo></mrow></mrow></math></span>.</p></div>","PeriodicalId":21690,"journal":{"name":"Scientific African","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2468227624002680/pdfft?md5=5b4caf61f1a3899582b1b19af9ca6086&pid=1-s2.0-S2468227624002680-main.pdf","citationCount":"0","resultStr":"{\"title\":\"The triviality of dihedral cohomology for operator algebras\",\"authors\":\"\",\"doi\":\"10.1016/j.sciaf.2024.e02325\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This article delves into algebraic topology, specifically (co)homology theory, which is essential in various mathematical fields. It explores different types of (co)homology groups such as Hochschild, cyclic, reflexive, and dihedral, focusing on dihedral cohomology generated by the dihedral group operating on simplicial complexes. The text discusses when dihedral and reflexive cohomology vanishes and provides examples, along with proving a homomorphism between dihedral cohomology groups. Mathematical concepts like Banach spaces, <span><math><msup><mrow><mi>C</mi></mrow><mo>*</mo></msup></math></span>-algebras, and tensor products are elucidated to understand the algebraic structures involved. Theorems and proofs establish the relationships and properties of these cohomology groups, culminating in a canonical isomorphism theorem for the product of two algebras. Overall, the article aims to provide a comprehensive exploration of dihedral cohomology and its interplay with other algebraic structures, offering insights into its applications and theoretical foundations. Additionally, it studies the (co)homology theory of <span><math><msup><mrow><mi>C</mi></mrow><mo>*</mo></msup></math></span>-algebras, focusing on the triviality of cohomology groups of operator algebras and discovering the canonical isomorphism between any two unital <span><math><mi>K</mi></math></span> -algebras <span><math><mi>A</mi></math></span> and <span><math><mrow><mi>A</mi><msup><mrow></mrow><mo>′</mo></msup></mrow></math></span>: <span><math><mrow><mi>H</mi><msub><mi>D</mi><mi>n</mi></msub><mrow><mo>(</mo><mrow><mi>A</mi><mo>×</mo><msup><mi>A</mi><mo>′</mo></msup></mrow><mo>)</mo></mrow><mo>≅</mo><mi>H</mi><msub><mi>D</mi><mi>n</mi></msub><mrow><mo>(</mo><mi>A</mi><mo>)</mo></mrow><mo>⊕</mo><mi>H</mi><msub><mi>D</mi><mi>n</mi></msub><mrow><mo>(</mo><msup><mi>A</mi><mo>′</mo></msup><mo>)</mo></mrow></mrow></math></span>.</p></div>\",\"PeriodicalId\":21690,\"journal\":{\"name\":\"Scientific African\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2024-07-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2468227624002680/pdfft?md5=5b4caf61f1a3899582b1b19af9ca6086&pid=1-s2.0-S2468227624002680-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Scientific African\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2468227624002680\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MULTIDISCIPLINARY SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scientific African","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2468227624002680","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MULTIDISCIPLINARY SCIENCES","Score":null,"Total":0}
引用次数: 0
摘要
本文深入探讨了代数拓扑学,特别是(共)同调理论,这在各个数学领域都是至关重要的。文章探讨了不同类型的(共)同调群,如霍赫希尔德群、循环群、反身群和二重群,重点讨论了二重群产生的二重同调。文中讨论了二面同调和反折同调何时消失,并提供了一些例子,同时证明了二面同调群之间的同构。阐明了巴拿赫空间、C*-代数和张量积等数学概念,以理解其中涉及的代数结构。定理和证明确立了这些同调群的关系和性质,最终得出了两个代数的乘积的典范同构定理。总之,文章旨在全面探讨二面同调及其与其他代数结构的相互作用,为其应用和理论基础提供见解。此外,文章还研究了 C*-gebras 的(共)同调理论,重点探讨了算子代数的同调群的三重性,并发现了任意两个单元 K -algebras A 和 A′ 之间的典型同构:HDn(A×A′)≅HDn(A)⊕HDn(A′).
The triviality of dihedral cohomology for operator algebras
This article delves into algebraic topology, specifically (co)homology theory, which is essential in various mathematical fields. It explores different types of (co)homology groups such as Hochschild, cyclic, reflexive, and dihedral, focusing on dihedral cohomology generated by the dihedral group operating on simplicial complexes. The text discusses when dihedral and reflexive cohomology vanishes and provides examples, along with proving a homomorphism between dihedral cohomology groups. Mathematical concepts like Banach spaces, -algebras, and tensor products are elucidated to understand the algebraic structures involved. Theorems and proofs establish the relationships and properties of these cohomology groups, culminating in a canonical isomorphism theorem for the product of two algebras. Overall, the article aims to provide a comprehensive exploration of dihedral cohomology and its interplay with other algebraic structures, offering insights into its applications and theoretical foundations. Additionally, it studies the (co)homology theory of -algebras, focusing on the triviality of cohomology groups of operator algebras and discovering the canonical isomorphism between any two unital -algebras and : .