# Grassmannian.info

A periodic table of (generalised) Grassmannians.

## Generalised Grassmannian of type F4/P2

Basic information
dimension
20
index
5
Euler characteristic
96
Betti numbers
$\mathrm{b}_{ 0 } = 1$, $\mathrm{b}_{ 2 } = 1$, $\mathrm{b}_{ 4 } = 2$, $\mathrm{b}_{ 6 } = 3$, $\mathrm{b}_{ 8 } = 4$, $\mathrm{b}_{ 10 } = 5$, $\mathrm{b}_{ 12 } = 6$, $\mathrm{b}_{ 14 } = 7$, $\mathrm{b}_{ 16 } = 7$, $\mathrm{b}_{ 18 } = 8$, $\mathrm{b}_{ 20 } = 8$, $\mathrm{b}_{ 22 } = 8$, $\mathrm{b}_{ 24 } = 7$, $\mathrm{b}_{ 26 } = 7$, $\mathrm{b}_{ 28 } = 6$, $\mathrm{b}_{ 30 } = 5$, $\mathrm{b}_{ 32 } = 4$, $\mathrm{b}_{ 34 } = 3$, $\mathrm{b}_{ 36 } = 2$, $\mathrm{b}_{ 38 } = 1$, $\mathrm{b}_{ 40 } = 1$
$\mathrm{Aut}^0(\mathrm{F}_{4}/\mathrm{P}_{2})$
$\mathrm{F}_4$
$\pi_0\mathrm{Aut}(\mathrm{F}_{4}/\mathrm{P}_{2})$
$1$
$\dim\mathrm{Aut}^0(\mathrm{F}_{4}/\mathrm{P}_{2})$
52
Projective geometry
minimal embedding

$\mathrm{F}_{4}/\mathrm{P}_{2}\hookrightarrow\mathbb{P}^{ 1273 }$

degree
59440103424
Hilbert series
1, 1274, 226746, 13530946, 398854365, 7165159456, 89120247840, 834392061711, 6230595684236, 38688289695770, 206079503516250, 964375127552655, 4039414650906726, 15371603887448576, 53788767754641920, 174801943535518026, 531949251799112355, 1526442643899430426, 4154693993027531226, 10780524952684310824, ...
Exceptional collections

No full exceptional collection is known for $\mathbf{D}^{\mathrm{b}}(\mathrm{F}_{4}/\mathrm{P}_{2})$. Will you be the first to construct one? Let us know if you do!

Quantum cohomology

The small quantum cohomology is generically semisimple.

The big quantum cohomology is generically semisimple.

The eigenvalues of quantum multiplication by $\mathrm{c}_1(\mathrm{F}_{4}/\mathrm{P}_{2})$ are given by:

Homological projective duality