\begin{equation} \DeclareMathOperator\Gr{Gr} \DeclareMathOperator\LGr{LGr} \DeclareMathOperator\OGr{OGr} \DeclareMathOperator\SGr{SGr} \DeclareMathOperator\Kzero{K_0} \DeclareMathOperator\index{i} \DeclareMathOperator\rk{rk} \end{equation}

Grassmannian.info

A periodic table of (generalised) Grassmannians.

Generalised Grassmannian of type E6/P2

Betti numbers
\begin{align*} \mathrm{b}_{ 1 } &= 1 \\ \mathrm{b}_{ 2 } &= 1 \\ \mathrm{b}_{ 3 } &= 1 \\ \mathrm{b}_{ 4 } &= 2 \\ \mathrm{b}_{ 5 } &= 3 \\ \mathrm{b}_{ 6 } &= 3 \\ \mathrm{b}_{ 7 } &= 4 \\ \mathrm{b}_{ 8 } &= 5 \\ \mathrm{b}_{ 9 } &= 5 \\ \mathrm{b}_{ 10 } &= 5 \\ \mathrm{b}_{ 11 } &= 6 \\ \mathrm{b}_{ 12 } &= 6 \\ \mathrm{b}_{ 13 } &= 5 \\ \mathrm{b}_{ 14 } &= 5 \\ \mathrm{b}_{ 15 } &= 5 \\ \mathrm{b}_{ 16 } &= 4 \\ \mathrm{b}_{ 17 } &= 3 \\ \mathrm{b}_{ 18 } &= 3 \\ \mathrm{b}_{ 19 } &= 2 \\ \mathrm{b}_{ 20 } &= 1 \\ \mathrm{b}_{ 21 } &= 1 \\ \mathrm{b}_{ 22 } &= 1 \end{align*}
Basic information
dimension
21
index
11
Euler characteristic
72
Betti numbers
$\mathrm{b}_{ 1 } = 1$, $\mathrm{b}_{ 2 } = 1$, $\mathrm{b}_{ 3 } = 1$, $\mathrm{b}_{ 4 } = 2$, $\mathrm{b}_{ 5 } = 3$, $\mathrm{b}_{ 6 } = 3$, $\mathrm{b}_{ 7 } = 4$, $\mathrm{b}_{ 8 } = 5$, $\mathrm{b}_{ 9 } = 5$, $\mathrm{b}_{ 10 } = 5$, $\mathrm{b}_{ 11 } = 6$, $\mathrm{b}_{ 12 } = 6$, $\mathrm{b}_{ 13 } = 5$, $\mathrm{b}_{ 14 } = 5$, $\mathrm{b}_{ 15 } = 5$, $\mathrm{b}_{ 16 } = 4$, $\mathrm{b}_{ 17 } = 3$, $\mathrm{b}_{ 18 } = 3$, $\mathrm{b}_{ 19 } = 2$, $\mathrm{b}_{ 20 } = 1$, $\mathrm{b}_{ 21 } = 1$, $\mathrm{b}_{ 22 } = 1$
$\mathrm{Aut}^0(\mathrm{E}_{6}/\mathrm{P}_{2})$
adjoint group of type $\mathrm{E}_{ 6 }$
$\pi_0\mathrm{Aut}(\mathrm{E}_{6}/\mathrm{P}_{2})$
$\mathbb{Z}/2\mathbb{Z}$
$\dim\mathrm{Aut}^0(\mathrm{E}_{6}/\mathrm{P}_{2})$
78
Projective geometry
minimal embedding

$\mathrm{E}_{6}/\mathrm{P}_{2}\hookrightarrow\mathbb{P}^{ 77 }$

degree
151164
Hilbert series
1, 78, 2430, 43758, 537966, 4969107, 36685506, 225961450, 1198006524, 5597569328, 23474156784, 89644484592, 315415779120, 1032380107812, 3168537039954, 9180278955210, 25252641533405, 66272502260250, 166635797864250, 402908157902250, ...
Exceptional collections

No full exceptional collection is known for $\mathbf{D}^{\mathrm{b}}(\mathrm{E}_{6}/\mathrm{P}_{2})$. Will you be the first to construct one? Let us know if you do!