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AnotherPerson
  • Member for 9 years, 6 months
  • Last seen this week
  • Lexington, KY, USA
30 votes
3 answers
2k views

What is the largest set for which its set of self bijections is countable?

14 votes
3 answers
2k views

Why is $Set$ not equivalent to $Set^{op}$?

13 votes
1 answer
1k views

Higher math and statistics/probability

13 votes
3 answers
4k views

Is it possible to construct a field larger than the complex numbers?

11 votes
2 answers
845 views

How many closed subsets of $\mathbb R$ are there up to homeomorphism?

10 votes
2 answers
3k views

Birational Equivalence of Diophantine Equations and Elliptic Curves

7 votes
4 answers
2k views

Show that every sequence in $\mathbb{R}$ has a monotone subsequence

7 votes
2 answers
1k views

Is every closure of a metric space a completion?

5 votes
2 answers
2k views

Why not just define equivalence relations on objects and morphisms for equivalent categories?

4 votes
1 answer
367 views

Question Regarding Proof of Taylor Remainder Theorem in Tu's "An Introduction to Manifolds"

4 votes
1 answer
1k views

Torsion elements do not form a submodule.

4 votes
0 answers
102 views

Good Source For Mathematics News [closed]

4 votes
1 answer
578 views

If an isomorphism can be expressed as a composition of morphisms, what can we say about its components?

4 votes
2 answers
3k views

Clarification of proof that a circle is not homeomorphic to a closed interval.

4 votes
3 answers
80 views

Equal Field Extensions

4 votes
2 answers
69 views

General Concept of an Isomorphism

4 votes
1 answer
444 views

Computing the cohomology ring of $T = S^1 \times S^1$ using simplicial cohomology definitions

4 votes
0 answers
280 views

Proof that Nijenhuis Tensor is a Tensor

3 votes
1 answer
130 views

Notation Mistake in Game Theory Textbook?

3 votes
1 answer
147 views

Is there any benefit to solving integrals by trig substitution this way?

3 votes
0 answers
50 views

Criterion for Improvement

3 votes
1 answer
41 views

Example of a function which demonstrates this equivalent condition for continuity

3 votes
1 answer
411 views

What are some interesting/useful examples of "ambiently homeomorphic" subsets of $\mathbb R^m$?

3 votes
1 answer
204 views

Proof of Tensor Products from Atiyah and Macdonald's Commutative Algebra

3 votes
1 answer
330 views

Showing that these vector fields commute on the image

3 votes
1 answer
359 views

Cylinder of a continuous map $f: X \to Y$ is homotopy equivalent to $Y$

2 votes
1 answer
146 views

LS- category for suspensions of a topological space

2 votes
0 answers
111 views

Serre's Local Fields Proposition 2 Chapter 3

2 votes
1 answer
208 views

Can we construct a continuous but nowhere differentiable surface?

2 votes
1 answer
78 views

Bijections and Homeomorphisms involving $\mathbb{R}^{\mathbb{R}}$