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Complex, contact, Riemannian, pseudo-Riemannian and Finsler geometry, relativity, gauge theory, global analysis.

18 votes
Accepted

Are there any natural differential operators besides $d$?

I think your question, the way it is stated, makes one want to classify unary and binary (depending how far you generalise the question as written) invariant differential operators on tensor fields. T …
Vladimir Dotsenko's user avatar
15 votes
Accepted

definition of Hessian with respect to connection

(This is an elaboration on the comment of MG. I know I benefited a lot as an undergraduate from being shown this sort of argument once instead of having been told to check things in local coordinates, …
Vladimir Dotsenko's user avatar
10 votes
Accepted

Breaking up the free Lie algebra into GL irreps

The Whitehouse module referred to in one of the other answers is not necessary, since it is related to the cyclic operad Lie, that is to the representation of $S_{n+1}$ in $Lie(n)$. The decomposition …
Vladimir Dotsenko's user avatar
9 votes

Applications of super-mathematics to non-super mathematics

Superalgebras have been used in various questions of algebra in a very striking way. To give some instances: Kemer's proof of the fact that, over a field of zero characteristic, every system of ident …
5 votes

Formal geometry

Some ideas of references that come to my mind right away: Fuks, Cohomology of infinite-dimensional Lie algebras. - contains lots of things that are relevant to your question Gelfand and Kazhdan, Cer …
Vladimir Dotsenko's user avatar
3 votes

Take contraction wrt a vector field twice and define kernel mod image. Does that give anythi...

These constructions certainly are very recognisable and meaningful in the algebraic context, that is if you think of algebraic differential forms on an affine algebraic variety. Namely, the correspond …
Vladimir Dotsenko's user avatar
2 votes
Accepted

Does an analytic tensorial Lie structure on $S^2$ gives a fiberwise Abelian Lie algebra stru...

No. A skew-symmetric bilinear map $V\times V\to V$ satisfies the Jacobi identity automatically if $\dim V=2$ since the Jacobi identity is skew-symmetric in its arguments. So if you take a generic skew …
Vladimir Dotsenko's user avatar
2 votes
Accepted

Definitions fundamental forms and their geometric Intuition

It is very unhelpful that you give the wrong title of the paper you are asking for. In reality, the paper appears to be Cauchy's problem for Bach's equations of general relativity. R. Schimming Banach …
Vladimir Dotsenko's user avatar