{"title":"Limits and continuity","authors":"Walter Noll","doi":"10.4135/9781544307770.n2","DOIUrl":null,"url":null,"abstract":"(ξa)i := ξai for all ξ ∈ R and i ∈ I. (1.2) We are here interested in the case when I := N× or I := N, in which case the elements of R are called real sequences. We deal explicitly only with the case I := N×, but all the definitions and results below apply also to the case I := N. Definition 1: We say that the sequence b ∈ RN is a subsequence of a given sequence a ∈ RN if b = a ◦ σ for some strictly isotone σ : N× → N×, so that","PeriodicalId":377607,"journal":{"name":"Analysis and Beyond","volume":"112 50","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2020-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Analysis and Beyond","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4135/9781544307770.n2","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
(ξa)i := ξai for all ξ ∈ R and i ∈ I. (1.2) We are here interested in the case when I := N× or I := N, in which case the elements of R are called real sequences. We deal explicitly only with the case I := N×, but all the definitions and results below apply also to the case I := N. Definition 1: We say that the sequence b ∈ RN is a subsequence of a given sequence a ∈ RN if b = a ◦ σ for some strictly isotone σ : N× → N×, so that
(ξa)i := ξai for all ξ ∈ R and i ∈ I. (1.2) 我们在此关注的是 I := N× 或 I := N 的情况,在这种情况下,R 的元素称为实数序列。我们只明确处理 I := N× 的情况,但下面的所有定义和结果也适用于 I := N 的情况。 定义 1:如果 b = a ◦ σ 为某个严格同调的 σ : N× → N×,则我们说序列 b∈ RN 是给定序列 a∈ RN 的子序列,从而