Giovanni Moreno's user avatar
Giovanni Moreno's user avatar
Giovanni Moreno's user avatar
Giovanni Moreno
  • Member for 11 years, 11 months
  • Last seen more than a month ago
8 votes
3 answers
2k views

What does it mean that the Hessian is proportional to the metric?

3 votes
0 answers
71 views

Can a semisimple orbit always be identified with a cotangent bundle?

10 votes
1 answer
603 views

Is there a unique "natural" action of $\mathsf{SL}_{n+1}$ on $\mathbb{R}^n$?

5 votes
2 answers
778 views

Is the Lie quadric $Q^3$ isomorphic to the Lagrangian Grassmannian $\operatorname{LG}(2,4)$?

4 votes
1 answer
454 views

Invariants of symmetric forms with respect to the symplectic group

9 votes
2 answers
613 views

Contact distributions on $(G_2,P)$-type Cartan geometries in dimension 5

1 vote
1 answer
223 views

The bundle of symmetric affine connections as quotient of the second-order frame bundle

8 votes
0 answers
301 views

Co-filtered and pro-finite manifolds, filtered algebras, and differential calculus on them

14 votes
3 answers
2k views

Is there a "unique" homogeneous contact structure on odd-dimensional spheres?

7 votes
1 answer
218 views

Some intuition on the $SL_n$-module $V_{[1,1,...,1]}$

3 votes
1 answer
234 views

What is the curved version of the Tits fibration for $G_2$?

2 votes
1 answer
210 views

What is the space parametrising the curved sub-Cartan geometries of a flat Cartan geometry?

3 votes
1 answer
180 views

How to embed $S^2\mathbb{C}^2$ into $S^2S^3\mathbb{C}^2$ and get the ideal of the twisted cubic?

4 votes
2 answers
219 views

Is $\mathbb{P}T^*M$ a sub-Riemannian manifold if $M$ is Riemannian?

3 votes
0 answers
95 views

Invariant Lagrangians of a connection and its derivatives: how do they look like?

3 votes
1 answer
212 views

How many second-order PDEs can be obtained from a contact EDS?

5 votes
1 answer
427 views

Is the Veronese variety "enough" to describe all the $SL(V)$-orbits in $\mathbb{P}(\textrm{Sym}^dV)$?

1 vote
1 answer
200 views

Is there an algebraic way to characterise the ordinary integral flags?

6 votes
2 answers
434 views

Symplectic orthogonality and projective duality: how do they work together?

4 votes
1 answer
200 views

Does a $G$-structure on $M$ automatically descend to a contact $G$-structure on $\mathbb{P}T^*M$?

8 votes
2 answers
627 views

How to "lift" a transitive group action on a manifold?

4 votes
1 answer
218 views

Are all bidimensional second-order PDE at most quadratic in the top derivatives of Monge-Ampère type?

6 votes
1 answer
268 views

Is there a canonical split signature metric on $\mathbb{P}^n\times\mathbb{P}^{n\,\ast}$?

5 votes
0 answers
134 views

Relative invariants of $P\oplus P^*$

5 votes
3 answers
516 views

Can the conformal structure on the projective light-cone detect hyperplane sections?

4 votes
0 answers
428 views

Is there a well-known tautological bundle over $\mathbb{P}(\Lambda^nV)$?

35 votes
4 answers
2k views

Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?

2 votes
1 answer
293 views

What is the "type" of a contact vector field?

0 votes
1 answer
161 views

Extending derivations to the superposition closure

2 votes
1 answer
1k views

Tautological and normal bundles over flag manifolds and jet bundles