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JLA's user avatar
JLA's user avatar
JLA
  • Member for 11 years, 10 months
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40 votes
2 answers
8k views

Why isn't the 3 body problem solvable?

23 votes
3 answers
12k views

Intuitive explanation of Duhamel's principle

15 votes
1 answer
849 views

Lie algebra $\implies$ Lie group?

14 votes
5 answers
4k views

Uncountable disjoint union of $\mathbb{R}$

11 votes
2 answers
429 views

Can a simply connected manifold satisfy $M\simeq M\times M?$

8 votes
0 answers
151 views

Has the Hamiltonian Path Integral Been Made Rigorous?

7 votes
1 answer
2k views

Plate trick demonstrating SO(3) not simply connected.

7 votes
1 answer
2k views

Rotation $x \to x+a \pmod 1$ of the circle is Ergodic if and only if $a$ is irrational

5 votes
1 answer
694 views

Connection Between Fundamental Solution and Symmetries of PDE

4 votes
1 answer
227 views

To What Extent is the Fourier Inversion Theorem Due to the Self-Adjointedness of the Laplacian

4 votes
1 answer
361 views

Fiber Bundle: Hairbrush

4 votes
0 answers
411 views

J invariant of Elliptic Curve a Cross Ratio

4 votes
0 answers
83 views

Cohomology of Classifying Space/Simplicial Manifold

3 votes
1 answer
280 views

Relevance of Differential Forms

3 votes
1 answer
400 views

First Integral of Motion for Upper Half Plane Metric

3 votes
2 answers
651 views

Does Homotopy Equivalence Lead to a Homeomorphism?

3 votes
1 answer
259 views

Powers of Complex Numbers Are Linearly Independent

3 votes
2 answers
312 views

Question about conformal maps.

3 votes
1 answer
1k views

If $f\in L^1(\mathbb{R})$ is such that $\int_{\mathbb{R}}f\phi=0$ for all continuous compactly supported $\phi$, then $f\equiv 0$.

2 votes
2 answers
75 views

$\frac{\partial f(x,y)}{\partial x}=0$ whenever $f(x,y)=0\implies f(x,y)=g(y)$?

2 votes
1 answer
558 views

Connection between covariant derivative and basis vectors.

2 votes
2 answers
290 views

Gre Question Complex Number (plug and chug) [duplicate]

2 votes
0 answers
143 views

Subbundles of Direct Sum of Holomorphic Line Bundles

2 votes
1 answer
122 views

Is the universal cover of a classifying space always $\mathbb{R}^n$ if it is finite dimensional?

2 votes
1 answer
46 views

How to Identify Adjoint Orbit of $\mathfrak{s}\mathfrak{u}(2)$ with Riemann Sphere?

2 votes
1 answer
55 views

Morphisms from simplicial sets into groupoids are determined by what?

1 vote
1 answer
52 views

Given groups G, H, when can one find generators $F_G$ of $G$ such that $\text{Hom}_{group}(G,H)=\text{Hom}_{set}(F_G,H).$

1 vote
0 answers
108 views

Asymptotics of Oscillatory Integral: Is the Limit Zero?

1 vote
1 answer
70 views

Why is this a $C^*$ algebra? (twisted convolution algebra of $\mathbb{R}^2$)

1 vote
0 answers
38 views

Does every smooth manifold have a Hamiltonian triangulation?