Question

Homotopy with paths and inverse paths and a counterexample

score 477 · Answer 1 · 2019-08-09 16:12:44

477

Views

Homotopy with paths and inverse paths and a counterexample

Published on 09 Aug 2019 - 16:12

score 731 · Answer 2 · 2026-03-26 12:37:02

731

Views

Example of a non surjective and non injective induced homomorphism on $H_1$.

Published on 26 Mar 2026 - 12:37

score 87 · Answer 3 · 2026-03-26 23:10:56

87

Views

Is it possible to find such a computable function $f(n)$, there doesn't exist a limit point for $\lim_{n\to\infty} \frac{\sum_{k=1}^{n}f(k)}{2n} ?$

Published on 26 Mar 2026 - 23:10

score 107 · Answer 4 · 2019-08-10 23:29:33

107

Views

How to prove that $(\sqrt{3} + 1)b/2 < a < 1 + (\sqrt{3} + 1)b/2$?

Published on 10 Aug 2019 - 23:29

score 45 · Answer 5 · 2019-08-11 06:07:45

45

Views

Example of a function which is continuous in $\mathbb{R}_K$ but not in $\mathbb{R}_u$

Published on 11 Aug 2019 - 6:07

score 46 · Answer 6 · 2019-08-13 15:57:09

46

Views

Examples Needed for Different Topics

Published on 13 Aug 2019 - 15:57

score 69 · Answer 7 · 2026-03-24 14:52:52

69

Views

Intuitive example for Identical random variables

Published on 24 Mar 2026 - 14:52

score 808 · Answer 8 · 2019-08-20 19:57:38

808

Views

An autonomous system that is asymptotically stable is not also exponentially stable.

Published on 20 Aug 2019 - 19:57

score 46 · Answer 9 · 2019-08-22 14:45:47

46

Views

If $u$ is a real continuous function, then the $\text{supp} \ u = \overline{\{x \in \Omega ; u(x) \neq 0\}}$

Published on 22 Aug 2019 - 14:45

score 45 · Answer 10 · 2019-08-22 14:54:26

45

Views

Unique time reachability for two symmetric ODE

Published on 22 Aug 2019 - 14:54

score 299 · Answer 11 · 2019-08-23 19:33:57

299

Views

Let $G$ be a group and $A\subseteq G$. Showing $\{g\in G: gag^{-1}\in A \text{ for all } a\in A\}$ does not have to be a subgroup of $G$.

Published on 23 Aug 2019 - 19:33

score 201 · Answer 12 · 2026-03-28 15:13:57

201

Views

Counterexample to the fundamental theorem of comodules

Published on 28 Mar 2026 - 15:13

score 42 · Answer 13 · 2026-03-29 11:01:19

42

Views

What, if anything, is fundamentally special about plugging certain functions into certain ODEs?

Published on 29 Mar 2026 - 11:01

score 235 · Answer 14 · 2019-08-27 14:40:32

235

Views

Partition the real line into an uncountable number of half-open intervals?

Published on 27 Aug 2019 - 14:40

score 286 · Answer 15 · 2026-03-25 16:03:08

286

Views

Are there any $3$-Fermat-pseudoprimes of the form $k^4+1$?

Published on 25 Mar 2026 - 16:03

List Question

Homotopy with paths and inverse paths and a counterexample

Example of a non surjective and non injective induced homomorphism on $H_1$.

Is it possible to find such a computable function $f(n)$, there doesn't exist a limit point for $\lim_{n\to\infty} \frac{\sum_{k=1}^{n}f(k)}{2n} ?$

How to prove that $(\sqrt{3} + 1)b/2 < a < 1 + (\sqrt{3} + 1)b/2$?

Example of a function which is continuous in $\mathbb{R}_K$ but not in $\mathbb{R}_u$

Examples Needed for Different Topics

Intuitive example for Identical random variables

An autonomous system that is asymptotically stable is not also exponentially stable.

If $u$ is a real continuous function, then the $\text{supp} \ u = \overline{\{x \in \Omega ; u(x) \neq 0\}}$

Unique time reachability for two symmetric ODE

Let $G$ be a group and $A\subseteq G$. Showing $\{g\in G: gag^{-1}\in A \text{ for all } a\in A\}$ does not have to be a subgroup of $G$.

Counterexample to the fundamental theorem of comodules

What, if anything, is fundamentally special about plugging certain functions into certain ODEs?

Partition the real line into an uncountable number of half-open intervals?

Are there any $3$-Fermat-pseudoprimes of the form $k^4+1$?

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