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Continuum theory, point-set topology, spaces with algebraic structure, foundations, dimension theory, local and global properties.
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Miscenko example of linearly Lindelof non Lindelof is not normal
I think I figured that out.
Assume $U$ and $V$ are open in $M$ and $H \subseteq V$ and $K \subseteq U$, such that $U \cap V = \emptyset$.
Lemma: There are $\{D_n : n >0\}$ such that $D_n \subseteq U …