List questions from examples-counterexamples

Published on 22 Jun 2020 - 18:33

118

Views

Space which is path connected but not locally path connected

Published on 23 Feb 2026 - 1:04

128

Views

Find a function so that in $(0,0)$ is an isolated local maximum, in $(-17,0)$ and $(0,3)$ are an isolated minimum.

Published on 23 Jun 2020 - 12:14

247

Views

A function that integral equals to the function itself, but not an exponential function

Published on 24 Jun 2020 - 4:21

64

Views

Nontrivial example of a ring in which the union of ideals is an ideal

Published on 24 Jun 2020 - 12:36

701

Views

Can I say that every integrable function is measurable?

Published on 29 Mar 2026 - 10:07

717

Views

Is the composition of closed operators closed?

Published on 26 Jun 2020 - 5:49

77

Views

Which is an example of a monoidal category which cannot be braided?

Published on 30 Mar 2026 - 6:13

277

Views

Integration with respect to Borel measure

Published on 26 Jun 2020 - 13:11

81

Views

Slow variation of counting functions

Published on 28 Mar 2026 - 20:06

60

Views

Counter-example to $\nabla^2 f =0 \implies \nabla \times \nabla f =\vec 0$?

Published on 29 Mar 2026 - 8:15

163

Views

Is there an improper subset that isn't equal to its superset?

Published on 28 Jun 2020 - 11:32

39

Views

If $\frac{a}{k} - \frac{a(c-1)}{kb} > 1$, is $\frac{a}{k+1} - \frac{a(c-1)}{(k+1)b} > 1$?

Published on 29 Jun 2020 - 16:36

32

Views

Function composition and inflection points

Published on 30 Jun 2020 - 17:13

248

Views

“Natural” example of an undecidable subset of $\Bbb N$

Published on 23 Feb 2026 - 8:32

List Question

Are there examples of continuous, non-differentiable functions whose "rational derivative" exists?

Space which is path connected but not locally path connected

Find a function so that in $(0,0)$ is an isolated local maximum, in $(-17,0)$ and $(0,3)$ are an isolated minimum.

A function that integral equals to the function itself, but not an exponential function

Nontrivial example of a ring in which the union of ideals is an ideal

Can I say that every integrable function is measurable?

Is the composition of closed operators closed?

Which is an example of a monoidal category which cannot be braided?

Integration with respect to Borel measure

Slow variation of counting functions

Counter-example to $\nabla^2 f =0 \implies \nabla \times \nabla f =\vec 0$?

Is there an improper subset that isn't equal to its superset?

If $\frac{a}{k} - \frac{a(c-1)}{kb} > 1$, is $\frac{a}{k+1} - \frac{a(c-1)}{(k+1)b} > 1$?

Function composition and inflection points

“Natural” example of an undecidable subset of $\Bbb N$

Trending Questions

Popular # Hahtags

Popular Questions