Fanography

4-11 4-13

Fano variety 4-12

blowup of 2-33 in the disjoint union of two exceptional lines of the blowup

Picard rank

4 (others)

$-\mathrm{K}_X^3$

46

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

0

index

1

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

26

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

yes

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

yes

hyperelliptic

no

trigonal

no

This variety is rational.

This variety is the blowup of

• 3-30, in a curve of genus 0

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

• 5-1, in a curve of genus 0
• 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

#29

Fanosearch

#150

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}^3 \times \mathbb{P}^{8}$

bundle

$\mathcal{O}(1,1,0) \oplus \Lambda(0,0,1) \oplus \mathcal{O}(-1,1,1)$

See the big table for more information.

• none are K-stable
• none are K-polystable
• none are K-semistable

• the book

This variety is toric.

It corresponds to ID #8 on grdb.co.uk.