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seen Oct 16 at 8:09
It is great to learn math on this website.

Sep
24
awarded  Autobiographer
Jul
24
comment A topological criterion for connectedness of a semi-ample divisor
Artie, I think you right. Thank you! This reasoning is considerably simpler than what I had in mind.
Jul
24
comment A topological criterion for connectedness of a semi-ample divisor
Artie, thanks for your comment. Why $f: X\to Y$ has connected fibres?
Jul
24
revised A topological criterion for connectedness of a semi-ample divisor
added 10 characters in body
Jul
24
asked A topological criterion for connectedness of a semi-ample divisor
Jul
22
comment Non-vanishing of elements in cohomology of full Flag varieties
I finally got it :)
Jul
22
accepted Non-vanishing of elements in cohomology of full Flag varieties
Jul
21
comment Non-vanishing of elements in cohomology of full Flag varieties
Thank you very much David! I will need a bit of time to digest your proof :)
Jul
21
comment Non-vanishing of elements in cohomology of full Flag varieties
abx, yes thank you, I understand (I added one more tag - combinatorics). I ask this question here because for the moment I can not answer this combinatorial question.
Jul
21
revised Non-vanishing of elements in cohomology of full Flag varieties
edited tags
Jul
21
comment Non-vanishing of elements in cohomology of full Flag varieties
No Peter, I am interested in classes $\sigma_i$. If one replaces $\sigma_i$ by $\sigma_i-\sigma_{i-1}$ as you suggest, the question becomes completely different (and easy to answer)
Jul
21
asked Non-vanishing of elements in cohomology of full Flag varieties
Jul
20
accepted Rational normal curves on Grassmanians
Jul
16
comment A semi-ampleness criterion for homogeneous bundles on homogeneous spaces?
Tanks Jason! I could not understand that ${\cal F}(X)$ are global sections :) . But now once I've got it, your answer is crystal clear :)
Jul
16
accepted A semi-ampleness criterion for homogeneous bundles on homogeneous spaces?
Jul
16
comment A semi-ampleness criterion for homogeneous bundles on homogeneous spaces?
Jason, thank you for this detailed answer! I got that you prove that the bundle is globally generated, but I don't understand details. I have some questions that you might find very silly, but let me ask them. 1) What is the difference between $\cal F$ and ${\cal F}(X)$? 2) If this is the same thing then why the homomorphism $e$ is not an isomorphism?
Jul
16
asked A semi-ampleness criterion for homogeneous bundles on homogeneous spaces?
Jul
16
comment Rational normal curves on Grassmanians
Thank you Jason. As far as I've got, the idea is simple, these normal curves have the shape $(u_1+tv_1)\wedge ... \wedge (u_k+tv_k)$, where $(u_i,v_i)$ are bases in two $k$-planes, and $t$ is the parameter on the normal curve.
Jul
15
asked Rational normal curves on Grassmanians
Jul
10
accepted Colourings of $\mathbb Q\times \mathbb Q$ in three colours