List questions from examples-counterexamples

Published on 10 Apr 2015 - 19:33

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Finding a counter example for $ \left(A+A\right)'\subseteq\left(A'+A\right)\cup\left(A'+A'\right)$

Published on 14 Apr 2015 - 13:00

392

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Examples for Burnside problem.

Published on 26 Mar 2026 - 18:30

1.9k

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Example of a white noise series that is not a martingale difference series with respect to its natural filtration

Published on 28 Mar 2026 - 4:51

53.4k

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If $A$ is a square matrix and $A^2 = 0$ then $A=0$. Is this true? If not, provide a counter-example.

Published on 26 Mar 2026 - 21:25

52

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Example of $1-1$ Correspondence with Subgroups of Factor Group

Published on 16 Apr 2015 - 4:57

126

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What are some illustrative examples that demonstrate how $\succ$ can differ in behavior from $>$ and/or $\geq$?

Published on 30 Mar 2026 - 23:03

825

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Is $2^{\aleph_0} = \aleph_1$?

Published on 03 Apr 2026 - 3:23

93

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What is an example of transcendental extension such that a monomorphism cannot be extended?

Published on 18 Apr 2015 - 10:03

385

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Non-standard examples of Distributions

Published on 03 Apr 2026 - 7:17

58

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What is an example of $E/F,L/E$ are normal but $L/F$ is not.

Published on 18 Apr 2015 - 13:23

1k

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Totally disconnected space that is not $T_2$

Published on 26 Mar 2026 - 22:58

837

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Looking for examples of finite loops and monoids

Published on 22 Mar 2026 - 17:38

647

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Spaces in which "$A \cap K$ is closed for all compact $K$" implies "$A$ is closed."

Published on 19 Apr 2015 - 13:00

183

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Normal space is compact

Published on 20 Apr 2015 - 5:43

List Question

Construct measures on $\sigma(B)$ that agree on $B$

Finding a counter example for $ \left(A+A\right)'\subseteq\left(A'+A\right)\cup\left(A'+A'\right)$

Examples for Burnside problem.

Example of a white noise series that is not a martingale difference series with respect to its natural filtration

If $A$ is a square matrix and $A^2 = 0$ then $A=0$. Is this true? If not, provide a counter-example.

Example of $1-1$ Correspondence with Subgroups of Factor Group

What are some illustrative examples that demonstrate how $\succ$ can differ in behavior from $>$ and/or $\geq$?

Is $2^{\aleph_0} = \aleph_1$?

What is an example of transcendental extension such that a monomorphism cannot be extended?

Non-standard examples of Distributions

What is an example of $E/F,L/E$ are normal but $L/F$ is not.

Totally disconnected space that is not $T_2$

Looking for examples of finite loops and monoids

Spaces in which "$A \cap K$ is closed for all compact $K$" implies "$A$ is closed."

Normal space is compact

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