Fanography

4-10 4-12

Fano variety 4-11

blowup of 3-28 in $\{x\}\times E$, $x\in\mathbb{P}^1$ and $E$ the $(-1)$-curve

Picard rank

4 (others)

$-\mathrm{K}_X^3$

44

$\mathrm{h}^{1,2}(X)$

0

index

1

$\dim\mathrm{H}^0(X,\omega_X^\vee)$

25

$-\mathrm{K}_X$ very ample?

yes

$-\mathrm{K}_X$ basepoint free?

yes

hyperelliptic

no

trigonal

no

This variety is rational.

This variety is the blowup of

• 3-28, in a curve of genus 0
• 3-31, in a curve of genus 0

This variety can be blown up (in a curve) to

• 5-2, in a curve of genus 0

number of moduli

0

Bott vanishing

holds

The following period sequences are associated to this Fano 3-fold:

GRDB

#34

Fanosearch

#93

A full exceptional collection can be constructed using Orlov's blowup formula.

Alternatively, Kawamata has constructed a full exceptional collection for every smooth projective toric variety.

Generic semisimplicity of:

• small quantum cohomology, proved by Iritani in 2007, see [MR2359850] , using toric geometry

Fano 3-folds from homogeneous vector bundles over Grassmannians gives the following description(s):

variety

$\mathbb{P}^1 \times \mathbb{P}^2 \times \mathbb{P}^1 \times \mathbb{P}^6$

bundle

$\mathcal{O}(0,1,1,0) \oplus \mathcal{Q}_{\mathbb{P}^2}(0,0,0,1) \oplus\Lambda(0,0,0,1) \oplus \mathcal{O}(0,0,-1,1)$

See the big table for more information.

This variety is toric.

It corresponds to ID #10 on grdb.co.uk.