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
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
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
12
Isn't a differential curve with corners contradictory?
Oct 16, 2022
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
Orthonormal Frames don't imply Orthnormal Coordinate Frames
Apr 5, 2021
question
8
Are two homeomorphic hypersurfaces of the same smooth manifold also diffeomorphic?
Apr 16, 2021
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8
Commutation relations between covariant and Lie derivatives
6
Commutation relations between covariant and Lie derivatives

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