List questions from solution-verification

Published on 25 Feb 2018 - 0:33

76

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If $Y=\left\{(x_i)\in\prod_i X_i| \{i\in I:x_i≠ p_i\} \text{ is finite}\right\}$ and $Y_F=\{(x_i)\in\prod_i X_i| i∉ F:x_i=p_i\}$ then $\bigcup Y_F=Y$

Published on 28 Feb 2018 - 0:02

279

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Classifying automorphisms using a group presentation.

Published on 22 Mar 2026 - 18:42

38

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A convergence problem

Published on 16 Mar 2026 - 20:13

156

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Evaluate $\iint_D2x-2y \ dx \, dy$ using polar coordinates.

Published on 17 Mar 2026 - 19:35

381

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Is there a problem with this old Exam P actuarial probability question?

Published on 22 Mar 2026 - 13:14

155

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Proving uniform continuity of the exponential function on a semi-finite interval

Published on 08 Mar 2018 - 18:40

50

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How many different combinations of paths are there in this situation?

Published on 17 Mar 2026 - 19:12

48

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Showing that if $N\triangleleft G$ and $U\triangleleft H< G$ then $NU\triangleleft NH$.

Published on 18 Mar 2018 - 13:48

14.4k

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My Proof: Every convergent sequence is a Cauchy sequence.

Published on 17 Mar 2026 - 18:22

1.1k

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Finite union of countable sets is countable.

Published on 17 Mar 2026 - 5:57

2k

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Suppose that $ a,b \in \mathbb{Z}$ If 4 divides $ a^2 + b^2$, then $a$ and $b$ are not odd.

Published on 25 Mar 2018 - 19:46

10.6k

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Cantor set is compact?

Published on 16 Mar 2026 - 21:19

161

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If $G$ is a finite group, then every element in the group has a finite order which is at most equal to $|G|$

Published on 28 Mar 2018 - 16:54

228

Views

Rank of module over ID

Published on 16 Mar 2026 - 22:31

List Question

Is my proof that $\sum_{n=3}^\infty \log(\frac{n^2+n+1}{n^2})$ diverges correct?

If $Y=\left\{(x_i)\in\prod_i X_i| \{i\in I:x_i≠ p_i\} \text{ is finite}\right\}$ and $Y_F=\{(x_i)\in\prod_i X_i| i∉ F:x_i=p_i\}$ then $\bigcup Y_F=Y$

Classifying automorphisms using a group presentation.

A convergence problem

Evaluate $\iint_D2x-2y \ dx \, dy$ using polar coordinates.

Is there a problem with this old Exam P actuarial probability question?

Proving uniform continuity of the exponential function on a semi-finite interval

How many different combinations of paths are there in this situation?

Showing that if $N\triangleleft G$ and $U\triangleleft H< G$ then $NU\triangleleft NH$.

My Proof: Every convergent sequence is a Cauchy sequence.

Finite union of countable sets is countable.

Suppose that $ a,b \in \mathbb{Z}$ If 4 divides $ a^2 + b^2$, then $a$ and $b$ are not odd.

Cantor set is compact?

If $G$ is a finite group, then every element in the group has a finite order which is at most equal to $|G|$

Rank of module over ID

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