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user2520938
  • Member for 8 years, 11 months
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32 votes
Accepted

How can we prove that a binomial coefficient $n\choose m$is divisible by the ratio of $n$ and $\gcd(n,m)$?

20 votes
Accepted

May a 'ball' that has been 'cut off' still be called a 'ball'?

13 votes
Accepted

Is there a name for the curve $t \mapsto (t,t^2,t^3)$?

6 votes
Accepted

Minimal polynomial of $\sqrt[3]{2} + \sqrt{3}$

5 votes
Accepted

Are there matroids with $\mathcal F(M) \subsetneq \mathcal F(M^*)$ or $\mathcal C(M) \subsetneq \mathcal C(M^*)$?

4 votes

A small clarification about quotient spaces

4 votes

$\zeta(2n)$ proof

4 votes
Accepted

Erwin Kreyszig's Introductory Functional Analysis With Applications, Section 2.9, Problem 12

4 votes

What do sine, tan, cos actually mean?

4 votes
Accepted

Show that the sequence is exact

4 votes
Accepted

Terms like ds dx dy in metrics?

4 votes
Accepted

Showing that the action of the Lie group $SL(2,\mathbb{R})$ on the upper half plane $\mathbb{H}$ is smooth

4 votes

Why can we say "Let $(x_n)$ be a Cauchy sequence in $X$"?

4 votes
Accepted

Any line bundle on sphere is trivial

3 votes

Why is the inverse image functor on sheaves defined the way it is?

3 votes
Accepted

Why does $\mathrm{Tor}_0^R(M,N)\cong M\otimes_R N$?

3 votes

Two kings not in adjacent square

3 votes

Dependent permutations, a question.

3 votes

Why are asymptotically one half of the integer compositions gap-free?

3 votes

Why does $z\mapsto \exp(-z^2)$ have an antiderivative on $\mathbb C$?

3 votes

How do I know when to use "let" and "suppose" in a proof?

3 votes
Accepted

Express $-a^3 b + a^3 c+ab^3-a c^3-b^3c+bc^3$ as a product of linear factors.

3 votes

Property of a polynomial with no positive real roots

2 votes
Accepted

Is this a correct way of thinking about diffeomorphic manifolds?

2 votes

The set of singletons is a subset only on the discrete topology

2 votes
Accepted

Is it possible to conclude surjective from this theorem?

2 votes
Accepted

ordered set notation in functions

2 votes

Can a point have a nontrivial isometry group?

2 votes
Accepted

Understanding a proof of a theorem from S.Roman's "Advanced Linear Algebra"

2 votes
Accepted

Want to understand this slick proof of Green's Theorem using Stoke's Theorem