Andrei Moroianu's user avatar
Andrei Moroianu's user avatar
Andrei Moroianu's user avatar
Andrei Moroianu
  • Member for 13 years, 4 months
31 votes
Accepted

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

17 votes

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

16 votes
Accepted

Non-Kahler "Calabi-Yau"?

10 votes

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

9 votes
Accepted

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

8 votes

Killing vectors and Ricci Tensor

7 votes
Accepted

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

6 votes
Accepted

Can two Consecutive Polynomials both be perfect ?

6 votes
Accepted

geodesic 2-dimensional submanifolds of a Riemannian manifold

5 votes

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

5 votes
Accepted

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

4 votes
Accepted

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

4 votes

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

4 votes

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

4 votes
Accepted

A simple ODE on smooth manifolds

3 votes

metrics on complex vector bundles..