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Thomas Richard

Créteil

http://perso-math.univ-mlv.fr/users/richard.thomas/

Now at "Université Paris Est Créteil". I work in Riemannian geometry, and more specifically on Ricci flow.

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Top Questions
15 votes

Is there an elementary way to explain that a map of the earth cannot preserve distances?

undergraduate-education geometry asked Jan 13, 2015 at 15:20
matheducators.stackexchange.com

14 votes

Algebraic characterization of the curvature operator of symmetric spaces

dg.differential-geometry riemannian-geometry symmetric-spaces holonomy asked Jan 25, 2013 at 11:40
mathoverflow.net

13 votes

Manifold whose universal covering is a sphere but which is not a space form?

gt.geometric-topology at.algebraic-topology dg.differential-geometry asked Sep 18, 2012 at 11:54
mathoverflow.net

11 votes

Minimum requirements for a Kähler manifold to be hyperkähler

dg.differential-geometry riemannian-geometry kahler-manifolds holonomy asked Jul 27, 2013 at 5:39
mathoverflow.net

11 votes

Bochner's formula on surfaces using moving coframes

dg.differential-geometry riemannian-geometry asked Nov 13, 2016 at 12:06
mathoverflow.net

11 votes

Geometry of Whitehead manifolds.

reference-request at.algebraic-topology dg.differential-geometry 3-manifolds asked Mar 23, 2011 at 10:24
mathoverflow.net

10 votes

Smoothability of compact Alexandrov surfaces with curvature bounded from below

dg.differential-geometry mg.metric-geometry alexandrov-geometry asked Jan 27, 2012 at 10:01
mathoverflow.net

10 votes

Metrically singular Alexandrov space.

mg.metric-geometry dg.differential-geometry alexandrov-geometry asked Jun 6, 2011 at 15:39
mathoverflow.net

10 votes

Is it overkill to invoke Kirszbraun theorem to prove the following fact ?

mg.metric-geometry alexandrov-geometry riemannian-geometry asked Feb 29, 2012 at 13:25
mathoverflow.net

9 votes

Complexity of matching red and blue points in the plane.

computational-geometry mg.metric-geometry algorithms reference-request asked Jan 28, 2012 at 16:23
mathoverflow.net

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Top Answers
20
Roadmap to learning about Ricci Flow?
mathoverflow.net

13
Topologie sur l'ensemble des sous-groupes de GL_n(R)
mathoverflow.net

12
Are small $\varepsilon$-balls convex in geodesic metric spaces?
mathoverflow.net

11
Coordinate-free derivation of the Einstein's field equation from the Hilbert action.
mathoverflow.net

9
diagonalizability of the curvature operator
mathoverflow.net

9
Examples of great mathematical writing
mathoverflow.net

9
Smoothing of the distance function on a Riemannian manifold
mathoverflow.net

9
Curvature of maximum of two riemannian metrics
mathoverflow.net

8
Lipschitz equivalence of Riemannian metrics
mathoverflow.net

7
metric on ${\bf SPD}_n({\mathbb R})$
mathoverflow.net

7
Riemannian holonomy of generic manifolds
mathoverflow.net

7
Is every metric uniformly close to a metric with negative scalar curvature?
mathoverflow.net

6
Nearly constant curvature implies "nearly isometric" to a space form?
mathoverflow.net

6
Can one recover the smooth Gauss Bonnet theorem from the combinatorial Gauss Bonnet theorem as an appropriate limit?
mathoverflow.net

6
Is group theory useful in any way to optimization?
mathoverflow.net

6
Flat scalar curvature on 4 manifold
mathoverflow.net

5
Examples where it's useful to know that a mathematical object belongs to some family of objects
mathoverflow.net

5
Slick ways to make annoying verifications
mathoverflow.net

5
Background to understand Gromov's green book
mathoverflow.net

5
Gauss-Bonnet formula for 2-dimensional Alexandrov spaces
mathoverflow.net

5
Lower bound for the normal injectivity radius
mathoverflow.net

5
Sectional curvature and Gauss curvature
mathoverflow.net