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In each Menger manifold we construct: (i) a closed nowhere dense subset which is homeomorphic to and is universal nowhere dense in the sense that for each nowhere dense set there is a homeomorphism of such that ; (ii) a meager -set $\Sigma_0\subset MB\subset MhMh(B)\subset \Sigma_0$. Also we prove that any two universal meager -sets in are ambiently homeomorphic.

生成讲解博客的中文版本

生成AI智能校验的中文版本