List questions from examples-counterexamples

Published on 21 Nov 2014 - 18:28

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Zero sets in Mrówka spaces

Published on 22 Nov 2014 - 3:19

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How do I prove that this map is a homeomorphism?

Published on 26 Mar 2026 - 14:20

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Example of a series parallel graph with toughness greater than $\frac{4}{7}$

Published on 25 Mar 2026 - 23:38

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If two elements a,b have a gcd, do then at,bt also have a gcd?

Published on 25 Mar 2026 - 16:01

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Counterexample for "if every continuous function on $E$ is bounded, then $E$ is compact"

Published on 24 Nov 2014 - 16:42

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The set of differentiability of an extension from half-plane to the plane

Published on 24 Nov 2014 - 21:27

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Proof or counterexample: If $F\subseteq K$ and $r\in K$. If $[F(r):F]=4$ then $F(r)=F(r^3)$.

Published on 25 Nov 2014 - 3:07

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Dimension Field True/False.

Published on 25 Nov 2014 - 11:50

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Function in Lipschitz space

Published on 26 Mar 2026 - 16:02

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Example of topological space where there is a point and a subset $A $: $x \in \overline A $, but no sequence in $A $ converging to $x $?

Published on 25 Nov 2014 - 17:04

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Monoidal categories in which $\mathrm{Aut}(X \otimes Y) \cong \mathrm{Aut}(X) \sqcup \mathrm{Aut}(Y).$

Published on 25 Nov 2014 - 18:02

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Prove/Disprove: $v$ is an eigenvector of $T^n$ implies $v$ is an eigenvector of $T$

Published on 25 Nov 2014 - 18:07

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Caratheodory: Inner vs. Outer

Published on 25 Nov 2014 - 20:18

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Examples spectral sequence

Published on 25 Mar 2026 - 16:20

List Question

What are some examples of these kinds of commutative semirings?

Zero sets in Mrówka spaces

How do I prove that this map is a homeomorphism?

Example of a series parallel graph with toughness greater than $\frac{4}{7}$

If two elements a,b have a gcd, do then at,bt also have a gcd?

Counterexample for "if every continuous function on $E$ is bounded, then $E$ is compact"

The set of differentiability of an extension from half-plane to the plane

Proof or counterexample: If $F\subseteq K$ and $r\in K$. If $[F(r):F]=4$ then $F(r)=F(r^3)$.

Dimension Field True/False.

Function in Lipschitz space

Example of topological space where there is a point and a subset $A $: $x \in \overline A $, but no sequence in $A $ converging to $x $?

Monoidal categories in which $\mathrm{Aut}(X \otimes Y) \cong \mathrm{Aut}(X) \sqcup \mathrm{Aut}(Y).$

Prove/Disprove: $v$ is an eigenvector of $T^n$ implies $v$ is an eigenvector of $T$

Caratheodory: Inner vs. Outer

Examples spectral sequence

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