List questions from examples-counterexamples

Published on 15 Apr 2026 - 4:36

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Weak convexity and continuity

Published on 13 Apr 2026 - 10:39

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non compact nested closed sets in metric spaces.

Published on 10 Apr 2026 - 10:48

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How we can understand one category is small

Published on 13 Apr 2026 - 20:49

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Is a $C^\infty $ function local monotone at a minimum?

Published on 14 Apr 2026 - 6:36

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Left continuous magmas with no fixed points

Published on 11 Apr 2026 - 19:34

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Construct an example of set $A$ for which $A+A=A $ but $0∉cl(A)$

Published on 11 Apr 2026 - 18:27

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Primes of the form $\frac{n^2-n+4}{2}$ satisfy Hardy-Littlewood analogue?

Published on 17 Apr 2026 - 15:55

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Sequence of closed set in topological space

Published on 12 Apr 2026 - 9:16

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The product of a separable metric space and a Lindelöf space need not be Lindelöf

Published on 15 Apr 2026 - 8:43

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Assume that the function $f(x)$ is continuous and $\lim_{n\to\infty}f_n(x)=f(x)$. Does this imply that $f_n(x)$ is uniform convergent?

Published on 30 Apr 2026 - 6:02

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Example where Čech and derived functor cohomologies don't agree.

Published on 15 Apr 2026 - 1:09

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The product of metrizable space and one point lindelofication of the discrete space

Published on 21 Feb 2013 - 11:39

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Inequality change in $\mathbb{E}[ \max |\cdot|] $ due to $\max$

Published on 15 Apr 2026 - 15:53

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Theorem 6.2 in Gilbarg-Trudinger (Clarification)

Published on 16 Apr 2026 - 0:36

List Question

Is every open, bounded and simply connected subset of $\mathbb{R}^n$ essentially a ball?

Weak convexity and continuity

non compact nested closed sets in metric spaces.

How we can understand one category is small

Is a $C^\infty $ function local monotone at a minimum?

Left continuous magmas with no fixed points

Construct an example of set $A$ for which $A+A=A $ but $0∉cl(A)$

Primes of the form $\frac{n^2-n+4}{2}$ satisfy Hardy-Littlewood analogue?

Sequence of closed set in topological space

The product of a separable metric space and a Lindelöf space need not be Lindelöf

Assume that the function $f(x)$ is continuous and $\lim_{n\to\infty}f_n(x)=f(x)$. Does this imply that $f_n(x)$ is uniform convergent?

Example where Čech and derived functor cohomologies don't agree.

The product of metrizable space and one point lindelofication of the discrete space

Inequality change in $\mathbb{E}[ \max |\cdot|] $ due to $\max$

Theorem 6.2 in Gilbarg-Trudinger (Clarification)

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