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tmpys
  • Member for 10 years, 4 months
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37 votes
6 answers
28k views

Examples of prime ideals that are not maximal

6 votes
1 answer
351 views

Lists of small lattices and posets

6 votes
2 answers
149 views

Definition of a limit question

5 votes
3 answers
1k views

If $|G|=2n$ where $n$ is odd. Then $\prod_{g\in G}g\notin H$

4 votes
1 answer
464 views

Question about Sylow $p$-subgroups

3 votes
1 answer
2k views

A question about groups generated by two elements.

3 votes
2 answers
249 views

a question about distributive lattice

3 votes
2 answers
472 views

How can I find $\mathbb Z_4$ as an extension of $\mathbb Z_2$ by $\mathbb Z_2$?

3 votes
2 answers
5k views

How do I find all the homomorphisms from $D_4$ to $\Bbb Z_2\times\Bbb Z_2$?

3 votes
2 answers
176 views

I have a question about limit supremum and limit infimum.

3 votes
1 answer
447 views

I have a question about Lebesgue measure

3 votes
1 answer
63 views

How to simplify $(u\times v)\cdot (v\times w)\times (w\times z)$ without brute force ($u,v,w,z\in \mathbb{R}^3$)?

2 votes
1 answer
79 views

(T/F) A finite group $G$ has a subgroup of index $2$ if and only if its abelianized group $G/[G,G]$ has even order.

2 votes
1 answer
467 views

Why does the characteristic polynomial have only factors from the eigenvalues?

2 votes
3 answers
2k views

If $A$ has $n$ distinct eigenvalues, then every matrix that commutes with $A$ commutes with each other.

2 votes
1 answer
436 views

True or false: the group of invertible $2\times 2$ diagonal matrices over $\mathbb{Z}_7$ is cyclic.

2 votes
0 answers
50 views

The amount of ring homomorphisms from $Z_{12}$ to $Z_8$?

2 votes
1 answer
2k views

What is meant by "set map" or "map of sets" in this context.

2 votes
0 answers
31 views

Example of a non abelian group that is generated by subgroups that centralize each other

2 votes
1 answer
163 views

Simple modules over $F[x]$ are the $F[x]/I$ where $I$ is a prime ideal

2 votes
2 answers
550 views

Groups of order 6

2 votes
1 answer
247 views

How to find group homomorphisms from one group to another

2 votes
1 answer
1k views

Prove that $\mathbb{Q}\!\smallsetminus\!\mathbb{Z}$ is dense in $\mathbb{R}$

2 votes
3 answers
176 views

intro level set theory question.

2 votes
1 answer
40 views

Question about function on a lattice.

2 votes
1 answer
98 views

A question about direct products of subgroups of a finite group.

2 votes
2 answers
60 views

Question about normal subgroup chains

1 vote
1 answer
55 views

I need an example of a function with these properties.

1 vote
0 answers
148 views

how is the jordan-holder theorem used in conjunction with short exact sequences to construct groups of certain order?

1 vote
1 answer
580 views

Understanding a proof about splitting of short exact sequences.