User Will Brian

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Is there a locally countable and weakly Lindelöf space which is not ccc

answered Apr 18, 2019 at 12:52

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Example of self-dual hypergraph with infinite edges

answered Aug 10, 2018 at 10:32

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Bounds for a small cardinal

answered Sep 10, 2021 at 19:23

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Self-homeomorphism of Stone-Čech boundary with an isolated fixed point

answered May 3, 2021 at 13:06

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Induced subgraphs of the almost-disjointness graph

answered May 15, 2021 at 10:45

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State of the art on: "If a dynamical system is Li-Yorke chaotic, does there exist a Cantor scrambled set?"

answered Sep 11, 2022 at 12:03

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Searching for cofinal subsets of directed sets subject to finite constraints

answered Sep 27, 2022 at 19:56

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Are there such a complete metric space X of weight k (w(X)=k) and ....?

answered Apr 4, 2022 at 18:08

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Thick refinements of covers

answered May 25, 2018 at 17:44

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Numerical and topological density

answered Mar 9, 2016 at 11:35

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Sequentially indistinguishable topologies on a countable set

answered Jan 11, 2016 at 15:55

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Topological spaces with too many open sets

answered Aug 19, 2016 at 16:09

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Non-homeomorphic spaces that have continuous bijections between them

answered Apr 17, 2015 at 17:01

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Does the minor graph of graphs on $\mathbb{N}$ have an uncountable independent set?

answered Jun 3, 2015 at 16:51

3 votes

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Invariants of category in Polish spaces

answered Jan 10, 2016 at 3:25

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"Nice" and "nasty" partitions in graphs

answered Jul 21, 2015 at 13:41

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Does van der Waerden's Theorem hold for $\omega_1$?

answered May 22, 2015 at 20:10

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Example to $2^\kappa\nrightarrow (3)^2_\kappa$, plus closed walks of odd length?

answered Feb 9, 2016 at 22:34

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What is the height (or depth) of $[\mathbb{N}]^\infty$?

answered May 10, 2016 at 15:42

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Does any subset of $\beta\omega$ of cardinality $\mathfrak{c}$ have a weak P-point in its closure?

answered May 6, 2018 at 14:18

3 votes

The "strong" measure number

answered Sep 13, 2017 at 8:55

3 votes

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Infinite "$T_1$"- hypergraphs

answered Sep 18, 2017 at 13:44

3 votes

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Refining ultraconnected spaces to connected $T_2$ spaces

answered Aug 10, 2017 at 13:38

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Edge covers in infinite graphs

answered Nov 16, 2017 at 16:04

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Which topological spaces contain dense simply connected subspace?

answered May 3, 2017 at 17:59

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Large discrete subsets of connected $T_2$-spaces

answered Jan 6, 2017 at 14:46

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Covering measure one sets by closed null sets

answered Dec 13, 2016 at 19:20

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Minimal cardinality of non-bipartite sub-family of $[\omega]^\omega$

answered Jun 27, 2022 at 20:18

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Configurations of points and circles

answered Sep 1, 2022 at 13:05

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Bounds for a covering number of the circle group $\mathbb T$ by some its small subgroups

answered Sep 18, 2021 at 14:24

Stack Exchange Network

167 Answers

Is there a locally countable and weakly Lindelöf space which is not ccc

Example of self-dual hypergraph with infinite edges

Bounds for a small cardinal

Self-homeomorphism of Stone-Čech boundary with an isolated fixed point

Induced subgraphs of the almost-disjointness graph

State of the art on: "If a dynamical system is Li-Yorke chaotic, does there exist a Cantor scrambled set?"

Searching for cofinal subsets of directed sets subject to finite constraints

Are there such a complete metric space X of weight k (w(X)=k) and ....?

Thick refinements of covers

Numerical and topological density

Sequentially indistinguishable topologies on a countable set

Topological spaces with too many open sets

Non-homeomorphic spaces that have continuous bijections between them

Does the minor graph of graphs on $\mathbb{N}$ have an uncountable independent set?

Invariants of category in Polish spaces

"Nice" and "nasty" partitions in graphs

Does van der Waerden's Theorem hold for $\omega_1$?

Example to $2^\kappa\nrightarrow (3)^2_\kappa$, plus closed walks of odd length?

What is the height (or depth) of $[\mathbb{N}]^\infty$?

Does any subset of $\beta\omega$ of cardinality $\mathfrak{c}$ have a weak P-point in its closure?

The "strong" measure number

Infinite "$T_1$"- hypergraphs

Refining ultraconnected spaces to connected $T_2$ spaces

Edge covers in infinite graphs

Which topological spaces contain dense simply connected subspace?

Large discrete subsets of connected $T_2$-spaces

Covering measure one sets by closed null sets

Minimal cardinality of non-bipartite sub-family of $[\omega]^\omega$

Configurations of points and circles

Bounds for a covering number of the circle group $\mathbb T$ by some its small subgroups