Does the tangent bundle of the projective space split?
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Does the tangent bundle of the projective space $mathbb P^n$ over an algebraic closed field $k$ split i.e can be written as direct sum of two vector bundle of positive rank?
For cotangent bundle, the computation for the cohomology or hodge number shows it does not split as $h^{1,1}=1$. However, any higher cohomology of the tangent bundle vanishes.
algebraic-geometry
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add a comment |
$begingroup$
Does the tangent bundle of the projective space $mathbb P^n$ over an algebraic closed field $k$ split i.e can be written as direct sum of two vector bundle of positive rank?
For cotangent bundle, the computation for the cohomology or hodge number shows it does not split as $h^{1,1}=1$. However, any higher cohomology of the tangent bundle vanishes.
algebraic-geometry
$endgroup$
add a comment |
$begingroup$
Does the tangent bundle of the projective space $mathbb P^n$ over an algebraic closed field $k$ split i.e can be written as direct sum of two vector bundle of positive rank?
For cotangent bundle, the computation for the cohomology or hodge number shows it does not split as $h^{1,1}=1$. However, any higher cohomology of the tangent bundle vanishes.
algebraic-geometry
$endgroup$
Does the tangent bundle of the projective space $mathbb P^n$ over an algebraic closed field $k$ split i.e can be written as direct sum of two vector bundle of positive rank?
For cotangent bundle, the computation for the cohomology or hodge number shows it does not split as $h^{1,1}=1$. However, any higher cohomology of the tangent bundle vanishes.
algebraic-geometry
algebraic-geometry
asked Dec 9 '18 at 3:22
zzyzzy
2,5651420
2,5651420
add a comment |
add a comment |
1 Answer
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Using Borel-Bott-Weil theorem it is easy to check that
$$
Hom(T,T) cong k.
$$
This proves that $T$ is not split.
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Thank you! What about positive characterestic case?
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– zzy
Dec 9 '18 at 15:37
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In positive characteristic you can use Euler sequence to check that $Hom(T,T) = k$.
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– Sasha
Dec 9 '18 at 18:22
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
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active
oldest
votes
$begingroup$
Using Borel-Bott-Weil theorem it is easy to check that
$$
Hom(T,T) cong k.
$$
This proves that $T$ is not split.
$endgroup$
$begingroup$
Thank you! What about positive characterestic case?
$endgroup$
– zzy
Dec 9 '18 at 15:37
$begingroup$
In positive characteristic you can use Euler sequence to check that $Hom(T,T) = k$.
$endgroup$
– Sasha
Dec 9 '18 at 18:22
add a comment |
$begingroup$
Using Borel-Bott-Weil theorem it is easy to check that
$$
Hom(T,T) cong k.
$$
This proves that $T$ is not split.
$endgroup$
$begingroup$
Thank you! What about positive characterestic case?
$endgroup$
– zzy
Dec 9 '18 at 15:37
$begingroup$
In positive characteristic you can use Euler sequence to check that $Hom(T,T) = k$.
$endgroup$
– Sasha
Dec 9 '18 at 18:22
add a comment |
$begingroup$
Using Borel-Bott-Weil theorem it is easy to check that
$$
Hom(T,T) cong k.
$$
This proves that $T$ is not split.
$endgroup$
Using Borel-Bott-Weil theorem it is easy to check that
$$
Hom(T,T) cong k.
$$
This proves that $T$ is not split.
answered Dec 9 '18 at 8:20
SashaSasha
4,763139
4,763139
$begingroup$
Thank you! What about positive characterestic case?
$endgroup$
– zzy
Dec 9 '18 at 15:37
$begingroup$
In positive characteristic you can use Euler sequence to check that $Hom(T,T) = k$.
$endgroup$
– Sasha
Dec 9 '18 at 18:22
add a comment |
$begingroup$
Thank you! What about positive characterestic case?
$endgroup$
– zzy
Dec 9 '18 at 15:37
$begingroup$
In positive characteristic you can use Euler sequence to check that $Hom(T,T) = k$.
$endgroup$
– Sasha
Dec 9 '18 at 18:22
$begingroup$
Thank you! What about positive characterestic case?
$endgroup$
– zzy
Dec 9 '18 at 15:37
$begingroup$
Thank you! What about positive characterestic case?
$endgroup$
– zzy
Dec 9 '18 at 15:37
$begingroup$
In positive characteristic you can use Euler sequence to check that $Hom(T,T) = k$.
$endgroup$
– Sasha
Dec 9 '18 at 18:22
$begingroup$
In positive characteristic you can use Euler sequence to check that $Hom(T,T) = k$.
$endgroup$
– Sasha
Dec 9 '18 at 18:22
add a comment |
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