Andrei Moroianu

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Name	Andrei Moroianu
Member for	2 years
Seen	Mar 2 2011 at 13:00
Website	math.polytechnique.fr/~moroianu
Location	France
Age	42

I am CNRS researcher at the Ecole Polytechnique, Palaiseau, France.

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5

Questions

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Does $\mathrm{E}_7/(\mathrm{SU}_8/(\mathbb{Z}/2))$ carry an almost complex structure?

dg.differential-geometry at.algebraic-topology exceptional-groups symmetric-spaces

apr 21 11 at 23:07 Robert Bryant 21.8k●3●75●97

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Are there topological restrictions to the existence of almost quaternionic structures on compact manifolds?

dg.differential-geometry topology quaternionic-geometry

jun 5 at 17:21 Oldřich Spáčil 155●1●5

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Is there a good definition of the universal cover for non-connected Lie groups?

lie-groups gr.group-theory

nov 17 10 at 1:37 Allen Knutson 12.4k●1●23●64

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2

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Finite type vs. finite dimensional cohomology?

differential-topology

dec 9 10 at 14:51 Tom Goodwillie 26.7k●2●58●110

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A question about finite groups.

gr.group-theory soft-question group-cohomology finite-groups

nov 14 10 at 17:40 Derek Holt 331●1●3

16

Answers

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For which $b$ it is possible that $S^n$ can have a Lorentz metric? Why?

What is this subgroup of $\mathfrak S_{12}$ ?

Non-Kahler “Calabi-Yau”?

Is there always, for a given prime $p$, a prime $\ell<p$ that is not a quadratic residue mod $p$?

Generators for the Jordan algebra of symmetric 3-by-3 matrices

Can two Consecutive Polynomials both be perfect ?

What is the best way explain to undergraduates that all 1-dimensional manifolds are orientable?

Problems where we can’t make a canonical choice, solved by looking at all choices at once

Lower bound on the curvature of the curves on $M$

Killing vectors and Ricci Tensor

metrics on complex vector bundles..

Restriction of the Levi-Civita Connection to a Connection on the (Anti-)Holomorphic Forms

A simple ODE on smooth manifolds

geodesic 2-dimensional submanifolds of a Riemannian manifold

In a contact manifold, is every tranverse 1-foliation given by some Reeb vector field?

Are there topological restrictions to the existence of almost quaternionic structures on compact manifolds?

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