user avatar
user avatar
user avatar
Keith
  • Member for 8 years, 1 month
  • Last seen more than a week ago
19 votes
2 answers
6k views

Weak convergence in probability implies uniform convergence in distribution functions

9 votes
3 answers
4k views

An example of an infinitely differentiable function with compact support

8 votes
1 answer
5k views

Prove that an infinite sigma algebra contains an infinite sequence of disjoint sets and is uncountable

8 votes
1 answer
798 views

Showing that the composition of maps of constant rank does not have to be of constant rank

8 votes
4 answers
3k views

Are one-point sets always compact in any topological spaces?

7 votes
1 answer
9k views

Question about 'inner measure equals outer measure $\iff$ measurable set'

7 votes
1 answer
5k views

$l^p$ space not having inner product

6 votes
1 answer
523 views

Finding subspaces with trivial intersection

6 votes
1 answer
409 views

rational normal curve of degree 3 not written by intersection of two quadrics

6 votes
2 answers
791 views

finding an acyclic but not contractible space

5 votes
1 answer
2k views

questions about Folland real analysis chapter 1 exercise

5 votes
1 answer
241 views

If $\gamma$ is irrational, then $\frac{1}{n}\sum_{k=1}^nf(2\pi k \gamma)\to \int_T f(t)\,dt$

5 votes
1 answer
221 views

an example of stochastic matrix not derived from a unitary matrix

5 votes
1 answer
293 views

preimage of a polynomial union of closed paths

5 votes
2 answers
2k views

How to prove Riemann curvature identities

5 votes
2 answers
124 views

Is a principal bundle over a discrete base space necessarily trivial?

5 votes
0 answers
53 views

Given a covariant derivative, is there a metric tensor that has the covariant derivative as the metric connection?

5 votes
0 answers
30 views

What is the operator norm of the symmetric difference operator on a finite periodic lattice?

4 votes
1 answer
63 views

Extreme confusion with the instanton solutions and the measure on $\mathbb{R}^4$ or $S^4$..

4 votes
1 answer
305 views

Smooth map that is a topological submersion but not a smooth submersion

4 votes
4 answers
320 views

What is the equality of two functions (or maps)?

4 votes
3 answers
549 views

In any ring with unity, does $ab=1$ implies $ba=1$?

4 votes
3 answers
202 views

$\sum _{1}^{\infty}a_n^2/n$ converges then $(1/N)\sum_{1}^{N}a_n$ converges to zero.

4 votes
0 answers
85 views

$f(0)^2+f'(0)^2=4$ then $f(x_0)+f''(x_0)=0$ [duplicate]

4 votes
2 answers
110 views

limit of sequence defined by rationals and fractional parts

4 votes
1 answer
294 views

Entire function whose square or composition with itself is a polynomial

4 votes
2 answers
996 views

"isomorphic" normed spaces and reflexivity

4 votes
1 answer
268 views

Showing that a locally finite collection preserves the closure

4 votes
2 answers
142 views

How to construct a partition from a finite subcover?

4 votes
1 answer
939 views

Relation between vague convergence and weak convergence

1
2 3 4 5
12