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arXiv 2009.06925math.FA
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压缩$C_{0}$ -半群的空间是Baire空间

The space of contractive $C_{0}$-semigroups is a Baire space

Raj Dahya

摘要:

在无限维可分希尔伯特空间上,得到了压缩$C_{0}$ -半群空间在$\mathbb{R}_{+}$的紧子集上一致弱算子收敛拓扑下的剩余结果. 2009年,Alberner和Serény提出了一个开放问题:这个空间是否构成Baire空间?观察到酉半群的子空间是完全可度量的,并呼吁已知的密度结果,我们解决了这个问题积极表明,某些拓扑性质一般可以从稠密子空间转移到更大的空间。转移结果又依赖于通过无限对策对拓扑性质的分类。我们的方法是足够的一般性,并可以应用到其他情况下,例如,下的收缩拓扑空间。

英文摘要:

Working over infinite dimensional separable Hilbert spaces, residual results have been achieved for the space of contractive $C_{0}$-semigroups under the topology of uniform weak operator convergence on compact subsets of $\mathbb{R}_{+}$. Eisner and Serény raised in 2009 the open problem: Does this space constitute a Baire space? Observing that the subspace of unitary semigroups is completely metrisable and appealing to known density results, we solve this problem positively by showing that certain topological properties can in general be transferred from dense subspaces to larger spaces. The transfer result in turn relies upon classification of topological properties via infinite games. Our approach is sufficiently general and can be applied to other contexts, e.g. the space of contractions under the pw-topology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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