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Oct
15
answered Why wouldn't someone accept Gentzen's consistency proof?
Oct
8
answered Consistency of restricted forms of Martin's Axiom with the negation of the Continuum Hypothesis
Oct
2
answered Spaces where all compact subsets are closed
Sep
24
answered Is there always an equivalent metric which is not complete?
Sep
3
answered Mary Ellen Rudin's proof that all metric space are paracompact
Aug
28
answered Operators on the family of all subsets of a topological space that maybe generates a base for these family.
Aug
26
answered A locally metrizable, Lindelöf Hausdorff space that is not metrizable
Aug
24
answered Equality of sets of local isomorphisms between relations
Aug
22
answered A countable, compact KC-subspace of a hereditarily Lindelöf minimal KC-space
Aug
20
answered The Cantor set is not strong measure zero
Aug
17
answered Countably local finiteness and a related(?) property
Aug
1
answered Can every uncountable subset of $\mathbb R$ be split up this way?
Jul
31
answered Prove that $\mathbb{R}^{n}-A$ with the standard topology is connected where $n \geq 2$ and $A \subset \mathbb{R}^{n}$ is countable.
Jul
29
answered Constructing semi-regular spaces
Jul
22
answered If $A=[0, 1] \times (0, 1)$, which is a subspace of $I^2 = [0, 1] \times [0, 1],$ how are the sets $U_x = \{x\} \times (0, 1)$ open in $A$?
Jul
21
answered Is there an uncountable scattered subset of $\mathbb R$?
Jul
19
answered Is it true that $A$ is scattered?
Jul
16
answered Counterexample to “Urysohn Lemma for Hausdorff Spaces”
Jul
16
answered An Uncountable language , A Model of $\mathbb{N}$, A Problem.
Jul
14
answered Any well-ordered set must be inductive?