List questions from examples-counterexamples

Published on 30 Dec 2019 - 13:36

363

Views

Topological space which is homeomorphic to its square

Published on 25 Mar 2026 - 19:03

131

Views

Why does $\log\frac{x}{x-2}$ not equal $\log(x) - \log(x-2)$

Published on 31 Dec 2019 - 18:08

45

Views

Compactly supported continuous functions are dense in $L^1(\mu)$ where $\mu$ is Radon?

Published on 02 Jan 2020 - 11:06

739

Views

Example of weak convergence

Published on 04 Jan 2020 - 16:32

64

Views

Example of a (non-simple) right $R$-module that is not annihilated by the Jacobson radical $J(R)$.

Published on 04 Jan 2020 - 18:33

241

Views

Diffeomorphism and Automorphism

Published on 25 Mar 2026 - 12:30

34

Views

Some Questions about Preimages.

Published on 06 Jan 2020 - 3:10

49

Views

A function $f:(-1,1)\to \mathbb R$ which is differentiable and uniformly continuous but $f'$ is unbounded on the interval.

Published on 31 Mar 2026 - 13:17

75

Views

Does there exist a non-open connected set where the derivative of $f$ vanishes without $f$ being constant?

Published on 26 Mar 2026 - 19:01

42

Views

What are common ways of "building" objects from "smaller" objects?

Published on 09 Jan 2020 - 14:53

338

Views

For which categories is its Yoneda embedding essentially surjective?

Published on 09 Jan 2020 - 14:59

93

Views

Transitivity of group actions - examples

Published on 28 Mar 2026 - 20:54

61

Views

Counterexample of the reciprocal of Langrage's theorem.

Published on 11 Jan 2020 - 14:11

697

Views

Vector Spaces, Normed Vector Spaces and Metric spaces

Published on 12 Jan 2020 - 8:18

List Question

Is the squeeze theorem still valid when $|b_n| \leq |c_n| \leq |a_n|$?

Topological space which is homeomorphic to its square

Why does $\log\frac{x}{x-2}$ not equal $\log(x) - \log(x-2)$

Compactly supported continuous functions are dense in $L^1(\mu)$ where $\mu$ is Radon?

Example of weak convergence

Example of a (non-simple) right $R$-module that is not annihilated by the Jacobson radical $J(R)$.

Diffeomorphism and Automorphism

Some Questions about Preimages.

A function $f:(-1,1)\to \mathbb R$ which is differentiable and uniformly continuous but $f'$ is unbounded on the interval.

Does there exist a non-open connected set where the derivative of $f$ vanishes without $f$ being constant?

What are common ways of "building" objects from "smaller" objects?

For which categories is its Yoneda embedding essentially surjective?

Transitivity of group actions - examples

Counterexample of the reciprocal of Langrage's theorem.

Vector Spaces, Normed Vector Spaces and Metric spaces

Trending Questions

Popular # Hahtags

Popular Questions