{"title":"阿贝尔群中三元组的和","authors":"Ido Feldman, Assaf Rinot","doi":"10.1112/mtk.12200","DOIUrl":null,"url":null,"abstract":"<p>Motivated by a problem in additive Ramsey theory, we extend Todorčević's partitions of three-dimensional combinatorial cubes to handle additional three-dimensional objects. As a corollary, we get that if the continuum hypothesis fails, then for every Abelian group <i>G</i> of size ℵ<sub>2</sub>, there exists a coloring <math>\n <semantics>\n <mrow>\n <mi>c</mi>\n <mo>:</mo>\n <mi>G</mi>\n <mo>→</mo>\n <mi>Z</mi>\n </mrow>\n <annotation>$c:G\\rightarrow \\mathbb {Z}$</annotation>\n </semantics></math> such that for every uncountable <math>\n <semantics>\n <mrow>\n <mi>X</mi>\n <mo>⊆</mo>\n <mi>G</mi>\n </mrow>\n <annotation>$X\\subseteq G$</annotation>\n </semantics></math> and every integer <i>k</i>, there are three distinct elements <math>\n <semantics>\n <mrow>\n <mi>x</mi>\n <mo>,</mo>\n <mi>y</mi>\n <mo>,</mo>\n <mi>z</mi>\n </mrow>\n <annotation>$x,y,z$</annotation>\n </semantics></math> of <i>X</i> such that <math>\n <semantics>\n <mrow>\n <mi>c</mi>\n <mo>(</mo>\n <mi>x</mi>\n <mo>+</mo>\n <mi>y</mi>\n <mo>+</mo>\n <mi>z</mi>\n <mo>)</mo>\n <mo>=</mo>\n <mi>k</mi>\n </mrow>\n <annotation>$c(x+y+z)=k$</annotation>\n </semantics></math>.</p>","PeriodicalId":18463,"journal":{"name":"Mathematika","volume":null,"pages":null},"PeriodicalIF":0.8000,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1112/mtk.12200","citationCount":"0","resultStr":"{\"title\":\"Sums of triples in Abelian groups\",\"authors\":\"Ido Feldman, Assaf Rinot\",\"doi\":\"10.1112/mtk.12200\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Motivated by a problem in additive Ramsey theory, we extend Todorčević's partitions of three-dimensional combinatorial cubes to handle additional three-dimensional objects. As a corollary, we get that if the continuum hypothesis fails, then for every Abelian group <i>G</i> of size ℵ<sub>2</sub>, there exists a coloring <math>\\n <semantics>\\n <mrow>\\n <mi>c</mi>\\n <mo>:</mo>\\n <mi>G</mi>\\n <mo>→</mo>\\n <mi>Z</mi>\\n </mrow>\\n <annotation>$c:G\\\\rightarrow \\\\mathbb {Z}$</annotation>\\n </semantics></math> such that for every uncountable <math>\\n <semantics>\\n <mrow>\\n <mi>X</mi>\\n <mo>⊆</mo>\\n <mi>G</mi>\\n </mrow>\\n <annotation>$X\\\\subseteq G$</annotation>\\n </semantics></math> and every integer <i>k</i>, there are three distinct elements <math>\\n <semantics>\\n <mrow>\\n <mi>x</mi>\\n <mo>,</mo>\\n <mi>y</mi>\\n <mo>,</mo>\\n <mi>z</mi>\\n </mrow>\\n <annotation>$x,y,z$</annotation>\\n </semantics></math> of <i>X</i> such that <math>\\n <semantics>\\n <mrow>\\n <mi>c</mi>\\n <mo>(</mo>\\n <mi>x</mi>\\n <mo>+</mo>\\n <mi>y</mi>\\n <mo>+</mo>\\n <mi>z</mi>\\n <mo>)</mo>\\n <mo>=</mo>\\n <mi>k</mi>\\n </mrow>\\n <annotation>$c(x+y+z)=k$</annotation>\\n </semantics></math>.</p>\",\"PeriodicalId\":18463,\"journal\":{\"name\":\"Mathematika\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.8000,\"publicationDate\":\"2023-04-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1112/mtk.12200\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Mathematika\",\"FirstCategoryId\":\"100\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1112/mtk.12200\",\"RegionNum\":3,\"RegionCategory\":\"数学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATHEMATICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mathematika","FirstCategoryId":"100","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1112/mtk.12200","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATHEMATICS","Score":null,"Total":0}
Motivated by a problem in additive Ramsey theory, we extend Todorčević's partitions of three-dimensional combinatorial cubes to handle additional three-dimensional objects. As a corollary, we get that if the continuum hypothesis fails, then for every Abelian group G of size ℵ2, there exists a coloring such that for every uncountable and every integer k, there are three distinct elements of X such that .
期刊介绍:
Mathematika publishes both pure and applied mathematical articles and has done so continuously since its founding by Harold Davenport in the 1950s. The traditional emphasis has been towards the purer side of mathematics but applied mathematics and articles addressing both aspects are equally welcome. The journal is published by the London Mathematical Society, on behalf of its owner University College London, and will continue to publish research papers of the highest mathematical quality.