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Behnam Esmayli's user avatar
Behnam Esmayli's user avatar
Behnam Esmayli's user avatar
Behnam Esmayli
  • Member for 7 years, 7 months
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19 votes
2 answers
487 views

A surprising inequality about a $\limsup$ for any sequence of positive numbers

10 votes
5 answers
315 views

When ODE tells more than the explicit solution.

5 votes
1 answer
268 views

How "practical" is the Laplace transform method for constant coefficient ODE?

3 votes
2 answers
1k views

Jacobian of non-square matrices

3 votes
1 answer
756 views

ALL Orthogonality preserving linear maps from $\mathbb R^n$ to $\mathbb R^n$?

3 votes
3 answers
111 views

If adding ONLY finitely many points to a (non-empty) subset of plane, $\mathbb{R}^2$ makes it closed, then is the closure all of $\mathbb{R}^2$?

3 votes
2 answers
62 views

Is it in $L^1$?

3 votes
1 answer
372 views

Tubular Neighborhoods VS Product Neighborhood (of a submanifold) [closed]

1 vote
1 answer
202 views

When is a continuous map $f: M \longrightarrow N$ between smooth manifolds homotopic to a smooth one?

1 vote
0 answers
466 views

Evan's proof of approximation by smooth functions up to the boundary of Sobolev functions

1 vote
0 answers
51 views

Is the sum uniformly continuous on $[0,\infty)$?

1 vote
2 answers
62 views

A continuous class of curves (solutions to a polynomial equation) degenerating at some mysterious value! Find that value.

1 vote
0 answers
73 views

Apply flow of $V$ to a segment of a curve, Do you get covariant derivative?

0 votes
2 answers
454 views

What is the shape of the shadow of the rim of my lamp shade?

0 votes
1 answer
65 views

Sharpest upper bound on $|f(x)|$ using multivariable Taylor approximation, Hessian, or any other method

0 votes
1 answer
60 views

Are boundedly compact metric space always equal to a countable union of their compact subsets?

-2 votes
2 answers
99 views

Simple but hard 2 by 2 system in $x$ and $y$ [duplicate]