Friedrich Knop's user avatar
Friedrich Knop's user avatar
Friedrich Knop's user avatar
Friedrich Knop
  • Member for 7 years, 11 months
  • Last seen this week
  • Spardorf, Germany
36 votes

Why are they called Spherical Varieties?

29 votes

Is it usual for a referee to heed updated versions on arxiv?

29 votes

17 camels trick

23 votes
Accepted

Is it acceptable to use the citation references like [1] or [Joh] as nouns in mathematical writing?

21 votes
Accepted

Can an analytic function defined on a maximal torus be extended analytically to all the Lie group?

21 votes

If $X\times X$ is rational, must $X$ also be rational?

20 votes
Accepted

Irreducible polynomial $p_{n}(x)=\sum_{k=0}^{n}\frac{x^k}{k!}$ for all positive integers $n$

19 votes
Accepted

Is the wonderful compactification of a spherical homogeneous variety always projective?

17 votes
Accepted

Where does the really nice '8-dimensional' description of the $E_7$ root system come from?

16 votes
Accepted

Conjecture of relation between residues of Feynman integrals and mixed Tate motives

15 votes
Accepted

Is the dimension of $V//G$ always the same as the dimension of $V^*//G$?

14 votes

Has anyone researched additive analogues of toric geometry in characteristic zero?

13 votes

Categorical Unification of Jordan Holder Theorems

13 votes
Accepted

Multiplicity of an irrep of SO(n-1) in SO(n)

13 votes
Accepted

Quasi-split tori and algebraic groups

12 votes
Accepted

Invariant polynomials under diagonal action of the orthogonal group

12 votes
Accepted

A finiteness property for semi-simple algebraic groups

12 votes
Accepted

How to write $\mathbb{C}[G/U_-]=\oplus_{\lambda} V_{\lambda}$ explicitly?

12 votes
Accepted

Affine GIT is an open map?

12 votes
Accepted

Division ring on a field

12 votes
Accepted

Is SO(2n+1)/U(n) a symmetric space?

12 votes
Accepted

Standard Monomial basis for other types

12 votes
Accepted

Are there indecomposable unsolvable four and five dimensional Lie algebras?

12 votes
Accepted

Endoscopic group that is not a subgroup

12 votes
Accepted

Does the orthogonal group act irreducibly on totally symmetric tensors?

12 votes

Under which conditions: dim(W1 + W2 + W3) = dim(W1) + dim(W2) + dim(W3) − dim(W1 ∩ W2) − dim(W2 ∩ W3) − dim(W3 ∩ W1) + dim(W1 ∩ W2 ∩ W3)

11 votes
Accepted

About the number of fixed points of a torus action

11 votes

Are the semi-simple elements in a non-connected reductive algebraic group dense?

11 votes
Accepted

On fixed point sets of actions of compact Lie groups

11 votes
Accepted

One-point compactification of ample line bundle

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