List questions from examples-counterexamples

Published on 14 Apr 2026 - 20:43

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Falacy in the arguement to show that $F$ is uniformly continuous in some punctured neighbourhood of $a$.

Published on 10 Apr 2026 - 1:37

269

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Stopping Time with Geometric Distribution

Published on 09 Apr 2026 - 3:15

356

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Example of a space which is Hausdorff and locally Euclidean but not paracompact?

Published on 14 Apr 2026 - 2:17

104

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Are components of complement of a set $S$ always close to $S$

Published on 09 Apr 2026 - 6:18

105

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A transversal matroid whose dual is not transversal

Published on 26 Mar 2026 - 11:06

3.3k

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Examples of homomorphism, endomorphism and automorphism

Published on 13 Apr 2026 - 2:14

278

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What is an example of a predense subset of a poset that contains no antichain?

Published on 28 Mar 2026 - 15:36

46

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A positive function $u$ such that $\liminf_{y\to x}u(y)=0$ for all $y$ but $u\neq 0$ a.e.?

Published on 14 Apr 2026 - 22:16

288

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Uniform Glivenko-Cantelli classes of functions, examples

Published on 15 Apr 2026 - 20:01

1.3k

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Conjectured primality test

Published on 09 Apr 2026 - 8:47

3k

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Non-isomorphic structures of the same cardinality which are elementary equivalent

Published on 16 Apr 2026 - 1:54

227

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Convergence in Distribution, Expectation, Variance

Published on 10 Apr 2026 - 18:49

4.3k

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Can a solved Sudoku game have an invalid region if all rows and columns are valid?

Published on 25 Mar 2026 - 9:32

7.2k

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Differentiable bijection $f:\mathbb{R} \to \mathbb{R}$ with nonzero derivative whose inverse is not differentiable

Published on 27 Mar 2026 - 2:59

List Question

Does there exist a divergent sequence such that $|x_{t+2}-x_{t+1}|<|x_{t+1}-x_t|$?

Falacy in the arguement to show that $F$ is uniformly continuous in some punctured neighbourhood of $a$.

Stopping Time with Geometric Distribution

Example of a space which is Hausdorff and locally Euclidean but not paracompact?

Are components of complement of a set $S$ always close to $S$

A transversal matroid whose dual is not transversal

Examples of homomorphism, endomorphism and automorphism

What is an example of a predense subset of a poset that contains no antichain?

A positive function $u$ such that $\liminf_{y\to x}u(y)=0$ for all $y$ but $u\neq 0$ a.e.?

Uniform Glivenko-Cantelli classes of functions, examples

Conjectured primality test

Non-isomorphic structures of the same cardinality which are elementary equivalent

Convergence in Distribution, Expectation, Variance

Can a solved Sudoku game have an invalid region if all rows and columns are valid?

Differentiable bijection $f:\mathbb{R} \to \mathbb{R}$ with nonzero derivative whose inverse is not differentiable

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