当前位置: X-MOL 学术Topol. Appl. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
There are arbitrarily large uniquely homogeneous spaces
Topology and its Applications ( IF 0.6 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.topol.2020.107349
Stewart Baldwin

Abstract A topological space X is uniquely homogeneous if for every a , b ∈ X , there is exactly one homeomorphism h : X → X such that h ( a ) = b . We say that X is strongly uniquely homogeneous if it is uniquely homogeneous and the only continuous functions f : X → X are homeomorphisms and constant functions. We show that if n ≥ 2 , then there is a strongly uniquely homogeneous subspace of R n , all of whose homeomorphisms are restrictions of isometries of R n (rigid motions if n is even). Using a similar construction, we show that if κ is an infinite cardinal, then there is a strongly uniquely homogeneous Hausdorff and completely regular space of cardinality 2 κ .

中文翻译:

存在任意大的唯一齐次空间

摘要 拓扑空间 X 是唯一齐次的,如果对于每个 a , b ∈ X ,恰好有一个同胚 h : X → X 使得 h ( a ) = b 。如果 X 是唯一齐次的并且唯一的连续函数 f : X → X 是同胚和常数函数,我们就说 X 是强唯一齐次的。我们证明,如果 n ≥ 2 ,则存在 R n 的一个强唯一齐次子空间,其所有同胚都是 R n 等距的限制(如果 n 是偶数,则为刚性运动)。使用类似的构造,我们证明如果 κ 是一个无限基数,那么存在一个强唯一齐次的 Hausdorff 和基数 2 κ 的完全规则空间。
更新日期:2020-09-01
down
wechat
bug