{"title":"无扭转部分可被平凡Brauer群整除的域","authors":"R. Fallah-Moghaddam","doi":"10.24330/ieja.1144156","DOIUrl":null,"url":null,"abstract":"Let $F_0$ be an absolutely algebraic field of characteristic $p>0$ and \n$\\kappa$ an infinite cardinal. It is shown that there exists a \nfield $F$ such that $F^*\\cong F^*_0\\oplus(\\oplus_\\kappa \n\\mathbb{Q})$ with $Br(F)=\\{0\\}$. Let $L$ be an algebraic closure \nof $F$. Then for any finite subextension $K$ of $L/F$, we have \n$K^*\\cong T(K^*)\\oplus(\\oplus_\\kappa \\mathbb{Q})$, where $T(K^*)$ \nis the group of torsion elements of $K^*$. In addition, \n$Br(K)=\\{0\\}$ and $[K:F]=[T(K^*) \\cup \\{0\\}:F_0]$.","PeriodicalId":43749,"journal":{"name":"International Electronic Journal of Algebra","volume":" ","pages":""},"PeriodicalIF":0.5000,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Fields whose torsion free parts divisible with trivial Brauer group\",\"authors\":\"R. Fallah-Moghaddam\",\"doi\":\"10.24330/ieja.1144156\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Let $F_0$ be an absolutely algebraic field of characteristic $p>0$ and \\n$\\\\kappa$ an infinite cardinal. It is shown that there exists a \\nfield $F$ such that $F^*\\\\cong F^*_0\\\\oplus(\\\\oplus_\\\\kappa \\n\\\\mathbb{Q})$ with $Br(F)=\\\\{0\\\\}$. Let $L$ be an algebraic closure \\nof $F$. Then for any finite subextension $K$ of $L/F$, we have \\n$K^*\\\\cong T(K^*)\\\\oplus(\\\\oplus_\\\\kappa \\\\mathbb{Q})$, where $T(K^*)$ \\nis the group of torsion elements of $K^*$. In addition, \\n$Br(K)=\\\\{0\\\\}$ and $[K:F]=[T(K^*) \\\\cup \\\\{0\\\\}:F_0]$.\",\"PeriodicalId\":43749,\"journal\":{\"name\":\"International Electronic Journal of Algebra\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2022-07-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Electronic Journal of Algebra\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.24330/ieja.1144156\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATHEMATICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Electronic Journal of Algebra","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.24330/ieja.1144156","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATHEMATICS","Score":null,"Total":0}
Fields whose torsion free parts divisible with trivial Brauer group
Let $F_0$ be an absolutely algebraic field of characteristic $p>0$ and
$\kappa$ an infinite cardinal. It is shown that there exists a
field $F$ such that $F^*\cong F^*_0\oplus(\oplus_\kappa
\mathbb{Q})$ with $Br(F)=\{0\}$. Let $L$ be an algebraic closure
of $F$. Then for any finite subextension $K$ of $L/F$, we have
$K^*\cong T(K^*)\oplus(\oplus_\kappa \mathbb{Q})$, where $T(K^*)$
is the group of torsion elements of $K^*$. In addition,
$Br(K)=\{0\}$ and $[K:F]=[T(K^*) \cup \{0\}:F_0]$.
期刊介绍:
The International Electronic Journal of Algebra is published twice a year. IEJA is reviewed by Mathematical Reviews, MathSciNet, Zentralblatt MATH, Current Mathematical Publications. IEJA seeks previously unpublished papers that contain: Module theory Ring theory Group theory Algebras Comodules Corings Coalgebras Representation theory Number theory.