Skip to main content
Arturo don Juan's user avatar
Arturo don Juan's user avatar
Arturo don Juan's user avatar
Arturo don Juan
  • Member for 10 years
  • Last seen more than a month ago
38 votes
6 answers
20k views

How to intuitively understand parallel transport

19 votes
2 answers
1k views

Is there a fundamental theorem of algebra for matrices?

14 votes
1 answer
6k views

Continuity $\iff$ Preimage is closed whenever set is closed

9 votes
2 answers
501 views

Why is Existence and Uniqueness for Navier-Stokes Easier in 2-D than in 3-D? [duplicate]

9 votes
1 answer
6k views

If every vector is an eigenvector, the operator must be a scalar multiple of the identity operator? [duplicate]

8 votes
1 answer
3k views

Cauchy Momentum Equation - Stress Tensor

7 votes
3 answers
4k views

Integration factor - First Order Nonlinear ODE

7 votes
2 answers
2k views

Method of Variation of Parameters - Assigning zero works?

7 votes
2 answers
299 views

How to solve differential equation $(y'/y)'=a((b/x^2)+xy)$?

6 votes
3 answers
14k views

Describe locus of points $z$ that satisfy $|z+2|+|z-2|=5$

5 votes
2 answers
2k views

Proving Injectivity $x + \sin(x)$

5 votes
0 answers
286 views

If $f : D(0,1) \rightarrow \mathbb{C}$ is a function, $f^2$ is holomorphic, and $f^3$ is holomorphic, then prove that $f$ is holomorphic. [duplicate]

5 votes
1 answer
637 views

Computing Fourier Transform of $\frac{1}{t^2+a^2}$

5 votes
3 answers
675 views

Find the remainder if $19^{55}$ is divided by 13.

5 votes
2 answers
5k views

What is an 'independent parameter' of a matrix?

5 votes
1 answer
490 views

Seemingly simple differential equation, $y'=(4x+y)/(x+4y)$

5 votes
2 answers
252 views

A simple proof of this equality: $\det_{\mu\nu}\left(\frac 1 2 \text{Tr}\left[A\sigma_\mu A^\dagger \sigma_\nu \right]\right)=1$

5 votes
2 answers
194 views

Contradiction in simple complex integral: should this pole contribute?

5 votes
1 answer
1k views

Hermite Polynomials: Rodrigues to Integral Representation

4 votes
2 answers
4k views

Why are the power series for trig functions in radians?

4 votes
2 answers
3k views

How to tell the rank of a semisimple Lie algebra?

4 votes
3 answers
193 views

How do you do this integral?

4 votes
1 answer
8k views

How is the entire $SO(2)$ group the standard rotation matrix?

4 votes
1 answer
369 views

Is there such thing as a rotation about a plane in higher dimensions?

4 votes
3 answers
79 views

ODE Guidance Needed

3 votes
0 answers
149 views

If the sum of absolute values of complex numbers is at least $1$, then some subset of these numbers has absolute value at least $C$

3 votes
0 answers
61 views

Is the exponential function the one this problem is hinting at?

3 votes
3 answers
6k views

Find the least positive integer $x$ that satisfies the congruence $90x\equiv 41\pmod {73}$

3 votes
0 answers
150 views

What is the "Enstrophy Miracle"?

3 votes
0 answers
106 views

Laurent Series Expansion of $e^{z+\frac{1}{z}}$ about $z_0=0$