3,716 reputation
11338
bio website www10.mathematik.uni-wuerzbur…
location Würzburg, Germany
age
visits member for 4 years, 7 months
seen Aug 25 at 9:53

Interests: Mathematical Physics, Deformation Quantization, Poisson and Symplectic Geometry, Noncommutative Geometry. Fréchet algebraic deformations.


Aug
14
reviewed Close Bounded pythagorean triples
Aug
13
reviewed No Action Needed Help for reference of moduli stack of fake elliptic curve
Aug
12
reviewed Close Reading list for basic geometry about curve ,surface and so on?
Aug
12
reviewed Close Limit of largest eigenvalue
Aug
12
reviewed Close understanding geometry of eigen values of Ricci tensor
Aug
11
reviewed Close Invariance of torsion and curvature
Aug
9
reviewed Close Smoothness of a power of smooth non-negative function
Aug
8
reviewed Close Mathematical software wish list
Aug
7
awarded  Nice Answer
Aug
6
reviewed Close Fredholm operators in $K$-theory?
Aug
4
reviewed Leave Open Extending an homotopy, knowing the two base functions extend
Aug
3
reviewed Leave Closed Recent progress on the busy beaver problem?
Aug
3
reviewed Close Any interesting properties of the matrix $M:=(m_{ij})$ with $m_{ij}=min(i,j)$?
Aug
3
reviewed Leave Open Proof of a Fourier pair with Bessel functions?
Aug
3
reviewed Leave Open examples of completely positive order zero maps to demonstrate a theorem
Jul
30
reviewed Close Why only Normed Linear Spaces?
Jul
27
comment Check symplectomorphism property on infinitesimal generators
For a connected LIe group, this is really a standard argument in Lie theory since any neighbourhood of the identity generates the connected component of the identity. In the nonconnected case you can not say anything reasonable: think of a discrete Lie group with non-symplectic group action...
Jul
23
reviewed Close Determinants of tensors
Jul
14
comment When to postpone a proof?
sad but true...
Jul
14
comment Stinespring's dilation without $C^{\ast}$-algebras
... among them the star product algebras which are not even algebras over $\mathbb{C}$ but over the formal power series ring $\mathbb{C}[[\hbar]]$. This exmplains why we were interested to extend the notions to more general scalars. Thanks also for the $\ell^1$ example. This I didn't know. I always use the continuous functions on the sphere with -involution given by complex conjugation *and the antipodal map, as you indicated also in your above comment. This has really creepy features for many reasons :)