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Tagged with sub-riemannian-geometry heisenberg-groups
7 questions
1
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Good references to understand sub-Riemannian geometry and Heisenberg groups
I'm looking for books and articles to understand a little about the Heisenberg group and sub-Riemannian geometry, specifically why the Heisenberg group is an example of a sub-Riemannian manifold, and ...
- 677
20
votes
1
answer
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Carnot-Carathéodory metric
The metric in sub-Riemannian geometry is often called the Carnot-Carathéodory metric.
Question 1. What is the origin of this name? Who was the first to introduce it?
I believe that the "...
- 28k
4
votes
1
answer
413
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Heisenberg groups, Carnot groups and contact forms
The horizontal distribution in the Heisenberg group is the kernel of the standard contact form:
$$
\alpha = dt + 2 \sum_{j=1}^n (x_j \, dy_j - y_j \, dx_j).
$$
Question. Can one describe ...
- 28k
6
votes
1
answer
3k
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Difference between the Laplacian and the sub-Laplacian of a Lie group
Given a Lie group $G$, what is the difference between the Laplacian $\Delta$ and the sub-Laplacian $\Delta_{sub}$ of $G$. And what are the properties that we lose when going from sub-Laplace to ...
- 650
4
votes
1
answer
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dirichlet problem in the heisenberg group
Good morning everybody.
I was looking just for a quick reference to know whether the Dirichlet problem has a solution in the Heisenberg group, that is $\mathbb R^3$ endowed with coordinates $(x,y,z)$ ...
- 277
4
votes
1
answer
383
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Horizontal Sobolev space on Carnot group
This question is connected with my previous: Heisenberg group: function without vertical derivative.
Here I am trying to look from another side: what is a difference between Sobolev space and ...
- 399
8
votes
0
answers
433
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Heisenberg group: function without vertical derivative
Let $\mathbb H$ be Heisenberg group with vector fields
$$
X=\partial_x - \frac12y\partial_t,\quad Y=\partial_y + \frac12x\partial_t,\quad T=\partial_t
$$
and $U\subset\mathbb H$ is an open set.
I am ...
- 399