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mathmetricgeometry
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question
9
Is a normal covering of the total space of a principal bundle also a principal bundle?
Mar 25, 2020
question
7
When does $\pi:M\to M/G$ have homotopy lifting property?
Jun 21, 2018
question
5
Fundamental group of compact manifolds with non-negative Ricci curvature and Bieberbach theorem
Apr 13, 2017
question
5
Prove that $S^{2n}$ doesn't admit topological group structure only by hairy ball theorem
Jul 3, 2021
question
4
Metrics $g_1\leqslant g_2$ implies the Ricci flow $g_1(t)\leqslant g_2(t)$?
Oct 11, 2017
question
4
Explicit examples of warped products Gromov converge to a cone
Nov 27, 2017
question
4
Is there a fiber bundle for Alexandrov spaces collapsing to a manifold?
Mar 1, 2018
question
4
How to compute fundamental groups of closed surfaces without using Van-Kampen theorem?
Mar 15, 2020
question
3
Are the Euler Characteristics of noncollapsed manifolds with bounded Ricci curvature uniformly bounded above?
Nov 29, 2017
question
3
harmonic functions on hyperbolic manifolds with finite volume is constant?
Dec 14, 2019
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Lifting criterion, where do we use "X is locally path connected" in the proof?