{"title":"来自大红心的最大θ$独立族的适当类","authors":"Calliope Ryan-Smith","doi":"arxiv-2408.10137","DOIUrl":null,"url":null,"abstract":"While maximal independent families can be constructed from ZFC via Zorn's\nlemma, the presence of a maximal $\\sigma$-independent family already gives an\ninner model with a measurable cardinal, and Kunen has shown that from a\nmeasurable cardinal one can construct a forcing extension in which there is a\nmaximal $\\sigma$-independent family. We extend this technique to construct\nproper classes of maximal $\\theta$-independent families for various uncountable\n$\\theta$. In the first instance, a single $\\theta^+$-strongly compact cardinal\nhas a set-generic extension with a proper class of maximal $\\theta$-independent\nfamilies. In the second, we take a class-generic extension of a model with a\nproper class of measurable cardinals to obtain a proper class of $\\theta$ for\nwhich there is a maximal $\\theta$-independent family.","PeriodicalId":501306,"journal":{"name":"arXiv - MATH - Logic","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Proper classes of maximal $θ$-independent families from large cardinals\",\"authors\":\"Calliope Ryan-Smith\",\"doi\":\"arxiv-2408.10137\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"While maximal independent families can be constructed from ZFC via Zorn's\\nlemma, the presence of a maximal $\\\\sigma$-independent family already gives an\\ninner model with a measurable cardinal, and Kunen has shown that from a\\nmeasurable cardinal one can construct a forcing extension in which there is a\\nmaximal $\\\\sigma$-independent family. We extend this technique to construct\\nproper classes of maximal $\\\\theta$-independent families for various uncountable\\n$\\\\theta$. In the first instance, a single $\\\\theta^+$-strongly compact cardinal\\nhas a set-generic extension with a proper class of maximal $\\\\theta$-independent\\nfamilies. In the second, we take a class-generic extension of a model with a\\nproper class of measurable cardinals to obtain a proper class of $\\\\theta$ for\\nwhich there is a maximal $\\\\theta$-independent family.\",\"PeriodicalId\":501306,\"journal\":{\"name\":\"arXiv - MATH - Logic\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-08-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv - MATH - Logic\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/arxiv-2408.10137\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - MATH - Logic","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2408.10137","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Proper classes of maximal $θ$-independent families from large cardinals
While maximal independent families can be constructed from ZFC via Zorn's
lemma, the presence of a maximal $\sigma$-independent family already gives an
inner model with a measurable cardinal, and Kunen has shown that from a
measurable cardinal one can construct a forcing extension in which there is a
maximal $\sigma$-independent family. We extend this technique to construct
proper classes of maximal $\theta$-independent families for various uncountable
$\theta$. In the first instance, a single $\theta^+$-strongly compact cardinal
has a set-generic extension with a proper class of maximal $\theta$-independent
families. In the second, we take a class-generic extension of a model with a
proper class of measurable cardinals to obtain a proper class of $\theta$ for
which there is a maximal $\theta$-independent family.