List questions from examples-counterexamples

Published on 11 Apr 2026 - 21:59

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Primality test for specific class of $N=k \cdot 2^n+1$

Published on 15 Apr 2026 - 13:31

206

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Examples of groups where any non-identity element has order $n$.

Published on 15 Apr 2026 - 0:23

75

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Where are the nonreal zero's of $\zeta(s) - \zeta(s + 1) + \zeta(s + 2) $ ??

Published on 15 Apr 2026 - 10:02

136

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What are some examples of non-trivial series that are equal to $0$?

Published on 13 Apr 2026 - 15:07

1.1k

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Is every complete metric space not countable?

Published on 11 Apr 2026 - 10:47

703

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Prove that both $A$ and $B$ are connected.

Published on 15 Apr 2026 - 16:28

33

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Connection between two types of convergence of random variable

Published on 11 Apr 2026 - 3:33

73

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If $H = Z(G),$ then $Z(G/H) = 1.$

Published on 14 Apr 2026 - 10:41

199

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Monotone class theorem for semi algebras

Published on 09 Apr 2026 - 8:05

63

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How bad can be the set where a convex and a continuous function agree?

Published on 11 Apr 2026 - 17:08

124

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Can there be more than 7 consecutive repdigit primes (extended from 1)?

Published on 12 Apr 2026 - 22:33

136

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Can the quotient by a nontrivial normal subgroup be isomorphic to the group?

Published on 14 Apr 2026 - 6:41

109

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Representation theory of finite groups searching for example that does not exist in char(K)=0?

Published on 11 Apr 2026 - 13:21

89

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Counterexample to show the set$ \left\{(x_{n})\in l^{p}:{\sum_{n=1}^{\infty}}x_{n}=0\right\}$ is not closed in $l^{p}$

Published on 14 Apr 2026 - 23:33

List Question

Help with this proof of inequality

Primality test for specific class of $N=k \cdot 2^n+1$

Examples of groups where any non-identity element has order $n$.

Where are the nonreal zero's of $\zeta(s) - \zeta(s + 1) + \zeta(s + 2) $ ??

What are some examples of non-trivial series that are equal to $0$?

Is every complete metric space not countable?

Prove that both $A$ and $B$ are connected.

Connection between two types of convergence of random variable

If $H = Z(G),$ then $Z(G/H) = 1.$

Monotone class theorem for semi algebras

How bad can be the set where a convex and a continuous function agree?

Can there be more than 7 consecutive repdigit primes (extended from 1)?

Can the quotient by a nontrivial normal subgroup be isomorphic to the group?

Representation theory of finite groups searching for example that does not exist in char(K)=0?

Counterexample to show the set$ \left\{(x_{n})\in l^{p}:{\sum_{n=1}^{\infty}}x_{n}=0\right\}$ is not closed in $l^{p}$

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