We will present some restrictions for a rigidity sequence of a nontrivial topological dynamical system. For instance, any finite linear combination of a rigidity sequence by integers has upper Banach density zero. However, there are rigidity sequences for some uniformly rigid systems whose reciprocal sums are infinite. We also show that if F is a family of subsets of natural numbers whose dual F* is filter, then a minimal F*-mixing system does not have F+-rigid factor for F∈F.
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机译:两岸四地累犯制度比较研究——兼论中国内地累犯制度一体化之构想 =Comparative Study on Recidivism System in Hong Kong, Macao, Taiwan and China: Concurrently Discuss the Conception of Recidivism System Integration in Mainland China
机译:ada编译器验证摘要报告。证书编号:920513W1.11253,VERDIX Corporation VaDs IBm RIsC system / 6000 => IBm RIsC system / 6000,版本6.2,Vada-110-71710 aIX下的IBm RIsC system / 6000 model 530,v3.2 => RIsC system / 6000型号320下