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BenL
  • Member for 7 years, 7 months
  • Last seen more than 5 years ago
  • Brooklyn, NY, United States
16 votes
3 answers
5k views

LU decomposition; do permutation matrices commute?

9 votes
3 answers
34k views

How to prove this limit does not exist

7 votes
2 answers
3k views

Changes of coordinates in differential geometry

6 votes
3 answers
1k views

Please critique my proof that $\sqrt{12}$ is irrational

5 votes
1 answer
7k views

Show that $ x^{(1/3)}$ is uniformly continuous on $\mathbb{R}$

4 votes
1 answer
110 views

How do we prove in general that $\lim_{t \to x} {t^a} = x^a$

3 votes
3 answers
12k views

If $g \circ f $ is injective, why must $f$ be injective but not $g$?

2 votes
1 answer
142 views

Second half of epsilon-delta limit proof

2 votes
2 answers
1k views

$r = \frac{m}{n} = \frac{p}{q} \Rightarrow (b^m)^{1/n} = (b^p)^{1/q}$; help with proof

2 votes
0 answers
41 views

Multiscale methods; clarifying notation

2 votes
1 answer
557 views

Expectation of product of more than two independent random variables

2 votes
2 answers
8k views

Prove that a uniformly convergent sequence of bounded functions is uniformly bounded

2 votes
4 answers
531 views

How to think about open sets and continuous functions on discrete metrics

1 vote
1 answer
911 views

Help me focus my study for the GRE math subject exam [closed]

1 vote
1 answer
2k views

Show that a monotonically increasing derivative must be continuous

1 vote
1 answer
67 views

Analytical explanation of $\delta$ functions in Fourier transform

1 vote
2 answers
417 views

Is the way we "compute limits" rigorous?

1 vote
1 answer
529 views

Prove that $f:(0, 1] \rightarrow \mathbb{R}$ is uniformly continuous iff $\lim\limits_{x \rightarrow 0} f(x)$ exists

1 vote
0 answers
50 views

Poisson maps in Hamiltonian PDEs (KdV in particular)

1 vote
1 answer
2k views

Implementing backward Euler with a nonlinear system

1 vote
1 answer
1k views

Minimizing function of a random variable; MLE over random parameters

1 vote
1 answer
2k views

Tips for using $\liminf$ and $\limsup$ in ratio/root tests

1 vote
1 answer
62 views

Please critique my proof regarding continuity

1 vote
1 answer
7k views

Frobenius Norm, Triangle inequality, and complex conjugates

1 vote
2 answers
516 views

How do I apply the divergence theorem to this region?

0 votes
2 answers
563 views

How do I relate the definition of a convex function to the geometrical meaning?

0 votes
2 answers
230 views

Proving well formed propositional statements have well defined truth values

0 votes
0 answers
737 views

Justifying moving a limit inside an infinite sum

0 votes
2 answers
63 views

Showing that a derivative is locally continuous

0 votes
2 answers
71 views

Biased estimation of $\mu^2$