List questions from examples-counterexamples

Published on 07 Aug 2023 - 11:26

136

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Minimize $\sum_{cyc}\sqrt{\frac{a+b+1}{c+ab}}$ if $ab+bc+ca=1.$

Published on 26 Mar 2026 - 7:44

35

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A natural factor map between subshifts

Published on 29 Mar 2026 - 14:27

96

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Prove $\mathcal T∘\mathcal R=\mathcal T∘\mathcal S$ for any $\mathcal T$ iff $\mathcal R∘\mathcal T=\mathcal S∘\mathcal T$ for any $\mathcal T$.

Published on 03 Apr 2026 - 13:41

202

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How to prove $\frac{1}{\sqrt{2a^2+2bc+17}}+\frac{1}{\sqrt{2b^2+2ca+17}}+\frac{1}{\sqrt{2c^2+2ab+17}}\le \frac{\sqrt{21}}{7}$

Published on 26 Mar 2026 - 7:46

38

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If the inclusion $X\setminus B\subseteq X\setminus A$ holds then does the inclusion $A\subseteq B$ even when $A$ and $B$ are not contained into $X$?

Published on 10 Aug 2023 - 16:23

169

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Is there a measure theoretic interpretation of rough path integrals?

Published on 23 Feb 2026 - 8:38

92

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Example of a specific polynomial

Published on 15 Aug 2023 - 14:50

128

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Colon of Two ideals in a ring

Published on 27 Mar 2026 - 1:44

28

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Find the domain, the range and the image of a relation which is intersection of relations.

Published on 03 Apr 2026 - 13:34

107

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Compact objects in the category of $n$-categories

Published on 29 Mar 2026 - 12:04

490

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Do any two connected spaces have a continuous surjection between them?

Published on 21 Aug 2023 - 10:38

47

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Does convergence along a diagonal grid imply convergence along other paths going to infinity?

Published on 28 Mar 2026 - 10:56

33

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Interval in AC spectrum of self-adjoint operator

Published on 01 Apr 2026 - 17:45

65

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Counterexample to Egorov for functions valued in non-separable metric space

Published on 25 Mar 2026 - 12:53

List Question

Closed embedding is not faithful on derived category

Minimize $\sum_{cyc}\sqrt{\frac{a+b+1}{c+ab}}$ if $ab+bc+ca=1.$

A natural factor map between subshifts

Prove $\mathcal T∘\mathcal R=\mathcal T∘\mathcal S$ for any $\mathcal T$ iff $\mathcal R∘\mathcal T=\mathcal S∘\mathcal T$ for any $\mathcal T$.

How to prove $\frac{1}{\sqrt{2a^2+2bc+17}}+\frac{1}{\sqrt{2b^2+2ca+17}}+\frac{1}{\sqrt{2c^2+2ab+17}}\le \frac{\sqrt{21}}{7}$

If the inclusion $X\setminus B\subseteq X\setminus A$ holds then does the inclusion $A\subseteq B$ even when $A$ and $B$ are not contained into $X$?

Is there a measure theoretic interpretation of rough path integrals?

Example of a specific polynomial

Colon of Two ideals in a ring

Find the domain, the range and the image of a relation which is intersection of relations.

Compact objects in the category of $n$-categories

Do any two connected spaces have a continuous surjection between them?

Does convergence along a diagonal grid imply convergence along other paths going to infinity?

Interval in AC spectrum of self-adjoint operator

Counterexample to Egorov for functions valued in non-separable metric space

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