Atom's user avatar
Atom's user avatar
Atom's user avatar
Atom
  • Member for 4 years, 11 months
  • Last seen this week
9 votes

Is the metric topology determined by its convergent sequences?

8 votes

What exactly is an $R$-algebra?

3 votes

Product of sets and supremum

2 votes

Elegant proofs that similar matrices have the same characteristic polynomial?

2 votes

Terence Tao Exercise 5.4.3: Integer part of $x$ proof.

2 votes

Clarification on a solution for Atiyah-Macdonald Chapter 1 Q.3.

2 votes
Accepted

Can someone explain me what's going on in the Artin-Tate lemma

2 votes
Accepted

Problem understanding May's proof of van Kampen

2 votes
Accepted

Disjoint union topology on disjoint subspaces is the same as the the subspace topology of their union?

1 vote

Where is the "polynomial-ness" used in Gauss' lemma?

1 vote

Ideal of ideal needs not to be an ideal

1 vote

Local ring if and only if $x$ or $1-x$ is unit

1 vote
Accepted

Proposition 4.5.4 from Tao's Analysis II

0 votes
Accepted

Necessity of Hausdorff-ness in "continuous function determined by its values on a dense subset"

0 votes

If $H$ is not normal subgroup of $G$ then there are two left cosets of $H$ which multiplication is not a left coset of $H$

0 votes

Why are box topology and product topology different on infinite products of topological spaces?

0 votes

Is it always true that $(A_1 \cup A_2) \times (B_1 \cup B_2)=(A_1\times B_1) \cup (A_2 \times B_2)$

0 votes
Accepted

Formalizing an application of axiom of choice

0 votes

Explanation of Zariski's lemma's proof from Atiyah-MacDonald

0 votes

The topology of a compact Hausdorff space $X$ is precisely the weak topology due to $C(X)$. How?

0 votes

Prove that the limit of $\sqrt{n+1}-\sqrt{n}$ is zero

0 votes

Does every bounded sequence have a Cauchy sub-sequence?

-1 votes
Accepted

Continuity of a similarity on the domain and codomain metric space