彩虹汉密尔顿循环随机几何图形

Alan Frieze, Xavier Pérez-Giménez
{"title":"彩虹汉密尔顿循环随机几何图形","authors":"Alan Frieze, Xavier Pérez-Giménez","doi":"10.1002/rsa.21201","DOIUrl":null,"url":null,"abstract":"Let <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0001\" display=\"inline\" location=\"graphic/rsa21201-math-0001.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mn>1</mn>\n</mrow>\n</msub>\n<mo>,</mo>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mn>2</mn>\n</mrow>\n</msub>\n<mo>,</mo>\n<mi>…</mi>\n<mo>,</mo>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mi>n</mi>\n</mrow>\n</msub>\n</mrow>\n$$ {X}_1,{X}_2,\\dots, {X}_n $$</annotation>\n</semantics></math> be chosen independently and uniformly at random from the unit <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0002\" display=\"inline\" location=\"graphic/rsa21201-math-0002.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mi>d</mi>\n</mrow>\n$$ d $$</annotation>\n</semantics></math>-dimensional cube <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0003\" display=\"inline\" location=\"graphic/rsa21201-math-0003.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<msup>\n<mrow>\n<mo stretchy=\"false\">[</mo>\n<mn>0</mn>\n<mo>,</mo>\n<mn>1</mn>\n<mo stretchy=\"false\">]</mo>\n</mrow>\n<mrow>\n<mi>d</mi>\n</mrow>\n</msup>\n</mrow>\n$$ {\\left[0,1\\right]}^d $$</annotation>\n</semantics></math>. Let <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0004\" display=\"inline\" location=\"graphic/rsa21201-math-0004.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mi>r</mi>\n</mrow>\n$$ r $$</annotation>\n</semantics></math> be given and let <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0005\" display=\"inline\" location=\"graphic/rsa21201-math-0005.png\" overflow=\"scroll\">\n<mrow>\n<mi>𝒳</mi>\n<mo>=</mo>\n<mfenced close=\"}\" open=\"{\" separators=\"\">\n<mrow>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mn>1</mn>\n</mrow>\n</msub>\n<mo>,</mo>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mn>2</mn>\n</mrow>\n</msub>\n<mo>,</mo>\n<mi>…</mi>\n<mo>,</mo>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mi>n</mi>\n</mrow>\n</msub>\n</mrow>\n</mfenced>\n</mrow></math>. The random geometric graph <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0006\" display=\"inline\" location=\"graphic/rsa21201-math-0006.png\" overflow=\"scroll\">\n<mrow>\n<mi>G</mi>\n<mo>=</mo>\n<msub>\n<mrow>\n<mi>G</mi>\n</mrow>\n<mrow>\n<mi>𝒳</mi>\n<mo>,</mo>\n<mi>r</mi>\n</mrow>\n</msub>\n</mrow></math> has vertex set <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0007\" display=\"inline\" location=\"graphic/rsa21201-math-0007.png\" overflow=\"scroll\">\n<mrow>\n<mi>𝒳</mi>\n</mrow></math> and an edge <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0008\" display=\"inline\" location=\"graphic/rsa21201-math-0008.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mi>i</mi>\n</mrow>\n</msub>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mi>j</mi>\n</mrow>\n</msub>\n</mrow>\n$$ {X}_i{X}_j $$</annotation>\n</semantics></math> whenever <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0009\" display=\"inline\" location=\"graphic/rsa21201-math-0009.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mo>‖</mo>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mi>i</mi>\n</mrow>\n</msub>\n<mo form=\"prefix\">−</mo>\n<msub>\n<mrow>\n<mi>X</mi>\n</mrow>\n<mrow>\n<mi>j</mi>\n</mrow>\n</msub>\n<mo>‖</mo>\n<mo>≤</mo>\n<mi>r</mi>\n</mrow>\n$$ \\left\\Vert {X}_i-{X}_j\\right\\Vert \\le r $$</annotation>\n</semantics></math>. We show that if each edge of <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0010\" display=\"inline\" location=\"graphic/rsa21201-math-0010.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mi>G</mi>\n</mrow>\n$$ G $$</annotation>\n</semantics></math> is colored independently from one of <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0011\" display=\"inline\" location=\"graphic/rsa21201-math-0011.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mi>n</mi>\n<mo>+</mo>\n<mi>o</mi>\n<mo stretchy=\"false\">(</mo>\n<mi>n</mi>\n<mo stretchy=\"false\">)</mo>\n</mrow>\n$$ n+o(n) $$</annotation>\n</semantics></math> colors and <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0012\" display=\"inline\" location=\"graphic/rsa21201-math-0012.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mi>r</mi>\n</mrow>\n$$ r $$</annotation>\n</semantics></math> has the smallest value such that <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0013\" display=\"inline\" location=\"graphic/rsa21201-math-0013.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mi>G</mi>\n</mrow>\n$$ G $$</annotation>\n</semantics></math> has minimum degree at least two, then <math altimg=\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0014\" display=\"inline\" location=\"graphic/rsa21201-math-0014.png\" overflow=\"scroll\">\n<semantics>\n<mrow>\n<mi>G</mi>\n</mrow>\n$$ G $$</annotation>\n</semantics></math> contains a rainbow Hamilton cycle asymptotically almost surely.","PeriodicalId":20948,"journal":{"name":"Random Structures and Algorithms","volume":"61 9","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Rainbow Hamilton cycles in random geometric graphs\",\"authors\":\"Alan Frieze, Xavier Pérez-Giménez\",\"doi\":\"10.1002/rsa.21201\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Let <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0001\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0001.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mn>1</mn>\\n</mrow>\\n</msub>\\n<mo>,</mo>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mn>2</mn>\\n</mrow>\\n</msub>\\n<mo>,</mo>\\n<mi>…</mi>\\n<mo>,</mo>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mi>n</mi>\\n</mrow>\\n</msub>\\n</mrow>\\n$$ {X}_1,{X}_2,\\\\dots, {X}_n $$</annotation>\\n</semantics></math> be chosen independently and uniformly at random from the unit <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0002\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0002.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mi>d</mi>\\n</mrow>\\n$$ d $$</annotation>\\n</semantics></math>-dimensional cube <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0003\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0003.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<msup>\\n<mrow>\\n<mo stretchy=\\\"false\\\">[</mo>\\n<mn>0</mn>\\n<mo>,</mo>\\n<mn>1</mn>\\n<mo stretchy=\\\"false\\\">]</mo>\\n</mrow>\\n<mrow>\\n<mi>d</mi>\\n</mrow>\\n</msup>\\n</mrow>\\n$$ {\\\\left[0,1\\\\right]}^d $$</annotation>\\n</semantics></math>. Let <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0004\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0004.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mi>r</mi>\\n</mrow>\\n$$ r $$</annotation>\\n</semantics></math> be given and let <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0005\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0005.png\\\" overflow=\\\"scroll\\\">\\n<mrow>\\n<mi>𝒳</mi>\\n<mo>=</mo>\\n<mfenced close=\\\"}\\\" open=\\\"{\\\" separators=\\\"\\\">\\n<mrow>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mn>1</mn>\\n</mrow>\\n</msub>\\n<mo>,</mo>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mn>2</mn>\\n</mrow>\\n</msub>\\n<mo>,</mo>\\n<mi>…</mi>\\n<mo>,</mo>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mi>n</mi>\\n</mrow>\\n</msub>\\n</mrow>\\n</mfenced>\\n</mrow></math>. The random geometric graph <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0006\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0006.png\\\" overflow=\\\"scroll\\\">\\n<mrow>\\n<mi>G</mi>\\n<mo>=</mo>\\n<msub>\\n<mrow>\\n<mi>G</mi>\\n</mrow>\\n<mrow>\\n<mi>𝒳</mi>\\n<mo>,</mo>\\n<mi>r</mi>\\n</mrow>\\n</msub>\\n</mrow></math> has vertex set <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0007\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0007.png\\\" overflow=\\\"scroll\\\">\\n<mrow>\\n<mi>𝒳</mi>\\n</mrow></math> and an edge <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0008\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0008.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mi>i</mi>\\n</mrow>\\n</msub>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mi>j</mi>\\n</mrow>\\n</msub>\\n</mrow>\\n$$ {X}_i{X}_j $$</annotation>\\n</semantics></math> whenever <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0009\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0009.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mo>‖</mo>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mi>i</mi>\\n</mrow>\\n</msub>\\n<mo form=\\\"prefix\\\">−</mo>\\n<msub>\\n<mrow>\\n<mi>X</mi>\\n</mrow>\\n<mrow>\\n<mi>j</mi>\\n</mrow>\\n</msub>\\n<mo>‖</mo>\\n<mo>≤</mo>\\n<mi>r</mi>\\n</mrow>\\n$$ \\\\left\\\\Vert {X}_i-{X}_j\\\\right\\\\Vert \\\\le r $$</annotation>\\n</semantics></math>. We show that if each edge of <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0010\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0010.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mi>G</mi>\\n</mrow>\\n$$ G $$</annotation>\\n</semantics></math> is colored independently from one of <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0011\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0011.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mi>n</mi>\\n<mo>+</mo>\\n<mi>o</mi>\\n<mo stretchy=\\\"false\\\">(</mo>\\n<mi>n</mi>\\n<mo stretchy=\\\"false\\\">)</mo>\\n</mrow>\\n$$ n+o(n) $$</annotation>\\n</semantics></math> colors and <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0012\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0012.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mi>r</mi>\\n</mrow>\\n$$ r $$</annotation>\\n</semantics></math> has the smallest value such that <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0013\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0013.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mi>G</mi>\\n</mrow>\\n$$ G $$</annotation>\\n</semantics></math> has minimum degree at least two, then <math altimg=\\\"urn:x-wiley:rsa:media:rsa21201:rsa21201-math-0014\\\" display=\\\"inline\\\" location=\\\"graphic/rsa21201-math-0014.png\\\" overflow=\\\"scroll\\\">\\n<semantics>\\n<mrow>\\n<mi>G</mi>\\n</mrow>\\n$$ G $$</annotation>\\n</semantics></math> contains a rainbow Hamilton cycle asymptotically almost surely.\",\"PeriodicalId\":20948,\"journal\":{\"name\":\"Random Structures and Algorithms\",\"volume\":\"61 9\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-11-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Random Structures and Algorithms\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1002/rsa.21201\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Random Structures and Algorithms","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1002/rsa.21201","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1

摘要

设X1 X2…Xn$$ {X}_1,{X}_2,\dots, {X}_n $$ 从单位d中独立均匀随机选取$$ d $$-维立方体[0,1$$ {\left[0,1\right]}^d $$. 设r$$ r $$ 设,f =X1,X2,…,Xn。随机几何图G=G∈,r具有顶点集∈∈和一条边∈$$ {X}_i{X}_j $$ $$ \left\Vert {X}_i-{X}_j\right\Vert \le r $$. 如果G的每条边$$ G $$ 与n+o(n)中的一个无关$$ n+o(n) $$ 颜色和r$$ r $$ 的值最小,使得G$$ G $$ 最小度至少为2,那么G$$ G $$ 几乎肯定包含一个渐近的彩虹汉密尔顿环。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rainbow Hamilton cycles in random geometric graphs
Let X 1 , X 2 , , X n $$ {X}_1,{X}_2,\dots, {X}_n $$ be chosen independently and uniformly at random from the unit d $$ d $$ -dimensional cube [ 0 , 1 ] d $$ {\left[0,1\right]}^d $$ . Let r $$ r $$ be given and let 𝒳 = X 1 , X 2 , , X n . The random geometric graph G = G 𝒳 , r has vertex set 𝒳 and an edge X i X j $$ {X}_i{X}_j $$ whenever X i X j r $$ \left\Vert {X}_i-{X}_j\right\Vert \le r $$ . We show that if each edge of G $$ G $$ is colored independently from one of n + o ( n ) $$ n+o(n) $$ colors and r $$ r $$ has the smallest value such that G $$ G $$ has minimum degree at least two, then G $$ G $$ contains a rainbow Hamilton cycle asymptotically almost surely.
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