Mathematics
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Didier
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I have been called an "autocratic teacher or professor who are blindly driving his/her students along the bloody path of his/her interest" once. But I prefer "Didier", which is shorter.

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All Questions Answers
Score Newest
answer
27
An example of an open ball whose closure is strictly between it and the corresponding closed ball
Oct 17
answer
13
What's the "best" place for working in Manifolds/Surfaces?
Nov 25, 2022
answer
12
If $M$ is a compact Riemannian manifold and $g$ and $\tilde{g}$ are metrics on $M$, then $\frac{1}{C} g \leq \tilde{g} \leq C g$ for $C > 1$
Jun 15, 2020
answer
12
Isn't a differential curve with corners contradictory?
Oct 16, 2022
answer
12
Why are we interested in Einstein metrics?
Jul 21
answer
12
Example of a function that is continuous at $c$ whose inverse is discontinuous at $f(c)$
Feb 20
answer
11
What is the arc length formula in a metric space?
Mar 17
answer
10
Prove that $f: \mathbb{R} \to \mathbb{R}, f(x) = x^\frac{1}{9}$ is not a differentiable function
Apr 5, 2021
answer
9
Can someone explain me the following statement about the covariant derivatives?
Nov 7, 2022
answer
8
Distance between antipodal points in a geodesic ball
Oct 1, 2022
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8
Commutation relations between covariant and Lie derivatives
6
Commutation relations between covariant and Lie derivatives

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