List questions from examples-counterexamples

Published on 11 Feb 2016 - 14:31

818

Views

A Compact Hausdorff Space with no Manifold Structure?

Published on 11 Apr 2026 - 13:14

4.1k

Views

Convergent sequence of irrational numbers that has a rational limit.

Published on 04 Apr 2026 - 2:29

626

Views

Example of maximum modulus principle

Published on 11 Apr 2026 - 2:42

826

Views

An example of smooth compactly supported function with everywhere non-vanishing Fourier transform

Published on 12 Apr 2026 - 13:18

72

Views

$ \sum_{n=1}^\infty \frac{x^4}{(1+x^4)^n} $ converges pointwise on $ R$, but not uniformly on $R$.

Published on 13 Feb 2016 - 12:16

3.3k

Views

Greedy algorithm fails to give chromatic number

Published on 13 Feb 2016 - 19:26

700

Views

Set with positive Lebesgue measure but no interval

Published on 11 Apr 2026 - 21:48

514

Views

Can someone provide some examples to illustrate the difference between Pointwise equicontinuity and Uniform equicontinuity?

Published on 11 Apr 2026 - 14:26

1.4k

Views

Example of a ring with an infinite inclusion chain of ideals

Published on 11 Apr 2026 - 21:32

3.9k

Views

Example of graph with specific $\chi (G)$, $\omega (G)$, $\beta (G)$

Published on 16 Feb 2016 - 1:20

978

Views

Is there a countably compact sequential non-$T_2$ space that is not sequentially compact?

Published on 12 Apr 2026 - 10:47

583

Views

Trivial power of line bundle

Published on 09 Apr 2026 - 16:57

45

Views

An example of a prime quotien ideal where his corresponding ideal is not prime

Published on 11 Apr 2026 - 9:29

210

Views

Can we construct a continuous but nowhere differentiable surface?

Published on 11 Apr 2026 - 6:43

List Question

What are types of coalgebras that are more naturally described by cooperads?

A Compact Hausdorff Space with no Manifold Structure?

Convergent sequence of irrational numbers that has a rational limit.

Example of maximum modulus principle

An example of smooth compactly supported function with everywhere non-vanishing Fourier transform

$ \sum_{n=1}^\infty \frac{x^4}{(1+x^4)^n} $ converges pointwise on $ R$, but not uniformly on $R$.

Greedy algorithm fails to give chromatic number

Set with positive Lebesgue measure but no interval

Can someone provide some examples to illustrate the difference between Pointwise equicontinuity and Uniform equicontinuity?

Example of a ring with an infinite inclusion chain of ideals

Example of graph with specific $\chi (G)$, $\omega (G)$, $\beta (G)$

Is there a countably compact sequential non-$T_2$ space that is not sequentially compact?

Trivial power of line bundle

An example of a prime quotien ideal where his corresponding ideal is not prime

Can we construct a continuous but nowhere differentiable surface?

Trending Questions

Popular # Hahtags

Popular Questions