List questions from examples-counterexamples

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Why doesn't logic, math, physics etc have a symbol for "example"?

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Classification of non-commutative, non-cocommutative Hopf algebras

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Given that $x_0$ is a real root of $x^3+px + q = 0$, how can I show that $p^2 \geq 4x_0q$?

Published on 16 Apr 2026 - 10:07

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Example of a strongly convex function where the Lipschitz constant $L$ is equal to the strong convexity parameter $u$

Published on 11 Apr 2026 - 6:23

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Classification of conjectures according to the number of counter-Examples

Published on 16 Apr 2026 - 11:09

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Proof of $\bigcup_{i\in I}A_i=\bigcup_{X\in\mathcal F}(\bigcup_{i\in X}A_i)$ and similar statements.

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"Naturally occurring" non-Hausdorff spaces?

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Further interesting examples? Obtaining (co)monoids from dual objects

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Completeness of $\mathcal{l}^1$?

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Matrix A,B,C 2/3 not invertible

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Example of a monotone Lipschitz operator that is not cocoercive?

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Group Examples: Best and Worst case of subgroup conjugate intersection

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$n$ is prime iff $\binom{n^2}{n} \equiv n \pmod{n^4}$?

Published on 16 Apr 2026 - 3:11

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Identifying relation between numbers based on equation relating them

Published on 12 Apr 2026 - 14:09

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Can someone explain and give brief examples of centralizer and normalizer?

Why doesn't logic, math, physics etc have a symbol for "example"?

Classification of non-commutative, non-cocommutative Hopf algebras

Given that $x_0$ is a real root of $x^3+px + q = 0$, how can I show that $p^2 \geq 4x_0q$?

Example of a strongly convex function where the Lipschitz constant $L$ is equal to the strong convexity parameter $u$

Classification of conjectures according to the number of counter-Examples

Proof of $\bigcup_{i\in I}A_i=\bigcup_{X\in\mathcal F}(\bigcup_{i\in X}A_i)$ and similar statements.

"Naturally occurring" non-Hausdorff spaces?

Further interesting examples? Obtaining (co)monoids from dual objects

Completeness of $\mathcal{l}^1$?

Matrix A,B,C 2/3 not invertible

Example of a monotone Lipschitz operator that is not cocoercive?

Group Examples: Best and Worst case of subgroup conjugate intersection

$n$ is prime iff $\binom{n^2}{n} \equiv n \pmod{n^4}$?

Identifying relation between numbers based on equation relating them

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