708 reputation
411
bio website
location Salerno, Italy
age 36
visits member for 3 years, 3 months
seen 1 hour ago

Reasonably expert in Differential Geometry, I work mostly with jet bundles and their natural structures trying to exploit them in the areas of nonlinear PDEs and Calculus of Variations.


Jun
17
awarded  Good Question
Jun
17
revised Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
Added a comment to Allen Knutson answer
Jun
16
awarded  Self-Learner
Jun
16
awarded  Yearling
Jun
16
accepted Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
Jun
16
answered Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
Jun
13
awarded  Nice Question
Jun
12
revised Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
Added a minor "footnote", added "symmetric" in the title
Jun
12
comment Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
@Holonomia: I'm aware of Plucker relations, but I believe they're not related to "my" linear combination. For a simple reason: Plucker relations (whichever way you're suggesting to implement them) hold for any value of $n$ and $k$, whereas "my" relations begin to reveal themselves for $n\geq 4$ and only for special values of $k$, which also don't show any regularity...
Jun
12
revised Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
Big edit of previous question "Is there any "space of $k^\textrm{th}$ order minors" of symmetric $n\times n$ matrices?" I made it more direct and easy to follow (I hope).
Jun
12
revised Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
edited body
Jun
12
asked Why there is a relation among the second-order minors of a symmetric $4\times 4$ matrix?
Mar
23
comment What is the “type” of a contact vector field?
I never doubted that type depended only on the conformal class of $\theta$. I wasn't sure it is invariant under the group of contact transformations. However, it is nice that you have such an "universal" sourcebook, and I'm going to have a look at it (I never read it from the beginning to the end, but I know it really contains a lot, so maybe I should do it!)
Mar
23
revised What is the “type” of a contact vector field?
Explained that the type is a function of $p\in M$
Mar
23
comment What is the “type” of a contact vector field?
@DanieleZuddas: yes, $X^k(\theta)$ is the $k^\textrm{th}$ derivative, and yes the type is in fact a function of the point $p\in M$.
Mar
23
revised What is the “type” of a contact vector field?
Added explanation of $X^k(\theta)$
Mar
23
asked What is the “type” of a contact vector field?
Mar
4
awarded  Yearling
Oct
23
revised Extending derivations to the superposition closure
added 787 characters in body
Oct
7
revised Extending derivations to the superposition closure
added 3 characters in body