List questions from examples-counterexamples

Published on 22 Apr 2026 - 1:44

90

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Looking for a theorem that can be reduced to a particular case

Published on 14 Apr 2026 - 15:46

52

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Points at distance one from an algebraic subset of $\mathbb R^n$

Published on 25 Mar 2026 - 18:56

36

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Let $f:\mathbb R^2\rightarrow \mathbb R$ s.t. $f(x,0)=x^2, f(0,y)=y^2$ then $f$ is differentiable

Published on 17 Apr 2026 - 3:29

47

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Term for example that is counterexample for "Conjecture A AND Conjecture B"

Published on 12 Apr 2026 - 0:20

179

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Are absolutely continuous functions analytic?

Published on 12 Apr 2026 - 13:32

142

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An example for $m^{}(\bigcap_{k=1}^{\infty} A_k) \ne \lim_{k \to \infty} m^{}(A_k)$?

Published on 15 Apr 2026 - 11:08

41

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Quotient map with finite fibre, locally compact source and non-locally compact target?

Published on 13 Apr 2026 - 13:32

729

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Applications of Riemann Series Theorem

Published on 13 Apr 2026 - 3:05

32

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Find a sequence of functions in $L^1$ with a given properties

Published on 17 Apr 2026 - 22:54

143

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semigroup in which Green's relations are different

Published on 05 May 2026 - 15:17

147

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A confusion in understanding Lebesgue measure

Published on 09 Apr 2026 - 7:29

1k

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In which cases connectedness and path connectedness are equivalent?

Published on 09 Apr 2026 - 14:59

265

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Examples of graph problems that are $\Omega(n^2)$ when using adjacency matrix representation.

Published on 16 Apr 2026 - 13:52

147

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Lusin's Theorem for a subset of rational numbers

Published on 11 Apr 2026 - 22:51

List Question

Finding examples for linear transformations with certain properties

Looking for a theorem that can be reduced to a particular case

Points at distance one from an algebraic subset of $\mathbb R^n$

Let $f:\mathbb R^2\rightarrow \mathbb R$ s.t. $f(x,0)=x^2, f(0,y)=y^2$ then $f$ is differentiable

Term for example that is counterexample for "Conjecture A AND Conjecture B"

Are absolutely continuous functions analytic?

An example for $m^{}(\bigcap_{k=1}^{\infty} A_k) \ne \lim_{k \to \infty} m^{}(A_k)$?

Quotient map with finite fibre, locally compact source and non-locally compact target?

Applications of Riemann Series Theorem

Find a sequence of functions in $L^1$ with a given properties

semigroup in which Green's relations are different

A confusion in understanding Lebesgue measure

In which cases connectedness and path connectedness are equivalent?

Examples of graph problems that are $\Omega(n^2)$ when using adjacency matrix representation.

Lusin's Theorem for a subset of rational numbers

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