Properties

Label 1.6.L.8.5g
  
Name \(L_2(D_{2,1})\)
Weight $1$
Degree $6$
Real dimension $6$
Components $8$
Contained in \(\mathrm{USp}(6)\)
Identity component \(\mathrm{U}(1)\times\mathrm{U}(1)_2\)
Component group \(C_2^3\)

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Invariants

Weight:$1$
Degree:$6$
$\mathbb{R}$-dimension:$6$
Components:$8$
Contained in:$\mathrm{USp}(6)$
Rational:yes

Identity component

Name:$\mathrm{U}(1)\times\mathrm{U}(1)_2$
$\mathbb{R}$-dimension:$6$
Description:$\left\{\begin{bmatrix}A&0&0\\0&\alpha I_2&0\\0&0&\bar\alpha I_2\end{bmatrix}: A\in\mathrm{U}(1)\subseteq\mathrm{SU}(2),\ \alpha\bar\alpha = 1,\ \alpha\in\mathbb{C}\right\}$ Symplectic form:$\begin{bmatrix}J_2&0&0\\0&0&I_2\\0&-I_2&0\end{bmatrix},\ J_2:=\begin{bmatrix}0&1\\-1&0\end{bmatrix}$
Hodge circle:$u\mapsto\mathrm{diag}(u,\bar u, u, u,\bar u, \bar u)$

Component group

Name:$C_2^3$
Order:$8$
Abelian:yes
Generators:$\begin{bmatrix}1 & 0 & 0 & 0 & 0 & 0 \\0 & 1 & 0 & 0 & 0 & 0 \\0 & 0 & 0 & 0 &0 & i \\0 & 0 & 0 & 0 & i & 0 \\0 & 0 & 0 & i & 0 & 0 \\0 & 0 & i & 0 & 0 & 0 \\\end{bmatrix}, \begin{bmatrix}1 & 0 & 0 & 0 & 0 & 0 \\0 & 1 & 0 & 0 & 0 & 0 \\0 & 0 & 0 & 1 & 0 & 0 \\0 & 0 & -1 & 0 & 0 & 0 \\0 & 0 & 0 & 0 & 0 & 1 \\0 & 0& 0 & 0 & -1 & 0 \\\end{bmatrix}, \begin{bmatrix}0 & 1 & 0 & 0 & 0 & 0 \\-1 & 0& 0 & 0 & 0 & 0 \\0 & 0 & 1 & 0 & 0 & 0 \\0 & 0 & 0 & 1 & 0 & 0 \\0 & 0 & 0 & 0 & 1 & 0 \\0 & 0 & 0 & 0 & 0 & 1 \\\end{bmatrix}$

Subgroups and supergroups

Maximal subgroups:$L_2(C_2)$, $L(D_{2,1},C_{2,1})$${}^{\times 2}$, $L_2(C_{2,1})$${}^{\times 2}$, $L_1(D_{2,1})$, $L(D_{2,1},C_2)$
Minimal supergroups:$L_2(D_{6,1})$, $L_2(D_{4,1})$, $L_2(J(D_2))$${}^{\times 3}$, $L_2(D_{6,2})$, $L_2(D_{4,2})$${}^{\times 2}$

Moment sequences

$x$ $\mathrm{E}[x^{0}]$ $\mathrm{E}[x^{1}]$ $\mathrm{E}[x^{2}]$ $\mathrm{E}[x^{3}]$ $\mathrm{E}[x^{4}]$ $\mathrm{E}[x^{5}]$ $\mathrm{E}[x^{6}]$ $\mathrm{E}[x^{7}]$ $\mathrm{E}[x^{8}]$ $\mathrm{E}[x^{9}]$ $\mathrm{E}[x^{10}]$ $\mathrm{E}[x^{11}]$ $\mathrm{E}[x^{12}]$
$a_1$ $1$ $0$ $3$ $0$ $39$ $0$ $780$ $0$ $19075$ $0$ $521388$ $0$ $15246462$
$a_2$ $1$ $3$ $14$ $90$ $794$ $8518$ $101411$ $1276873$ $16615946$ $220884750$ $2980519769$ $40667942923$ $559751591135$
$a_3$ $1$ $0$ $15$ $0$ $2001$ $0$ $493860$ $0$ $146834569$ $0$ $47079682020$ $0$ $15738294815364$

Moment simplex

$\left(\mathrm{E}\left[a_1^{e_1}a_2^{e_2}a_3^{e_3}\right]:\sum ie_i=2\right)\colon$ $3$ $3$
$\left(\mathrm{E}\left[a_1^{e_1}a_2^{e_2}a_3^{e_3}\right]:\sum ie_i=4\right)\colon$ $14$ $6$ $19$ $39$
$\left(\mathrm{E}\left[a_1^{e_1}a_2^{e_2}a_3^{e_3}\right]:\sum ie_i=6\right)\colon$ $15$ $90$ $47$ $164$ $96$ $353$ $780$
$\left(\mathrm{E}\left[a_1^{e_1}a_2^{e_2}a_3^{e_3}\right]:\sum ie_i=8\right)\colon$ $121$ $794$ $440$ $257$ $1672$ $963$ $3732$ $2140$ $8410$ $19075$
$\left(\mathrm{E}\left[a_1^{e_1}a_2^{e_2}a_3^{e_3}\right]:\sum ie_i=10\right)\colon$ $1226$ $8518$ $702$ $4774$ $2717$ $19024$ $10754$ $6110$ $43278$ $24410$ $98912$ $55650$ $226793$ $521388$
$\left(\mathrm{E}\left[a_1^{e_1}a_2^{e_2}a_3^{e_3}\right]:\sum ie_i=12\right)\colon$ $2001$ $13974$ $101411$ $7885$ $56560$ $31726$ $231818$ $17850$ $129408$ $72438$ $533246$ $297158$ $166037$ $1229722$
$$ $684173$ $2841552$ $1578528$ $6577158$ $15246462$

Moment matrix

$\mathrm{E}\left[\chi_i\chi_j\right] = \begin{bmatrix}1&0&2&0&0&0&1&5&0&0&0&2&0&0&6\\0&3&0&3&0&10&0&0&12&0&7&0&16&27&0\\2&0&9&0&5&0&16&24&0&9&0&34&0&0&70\\0&3&0&6&0&16&0&0&21&0&10&0&36&50&0\\0&0&5&0&15&0&24&20&0&23&0&56&0&0&98\\0&10&0&16&0&62&0&0&86&0&48&0&140&212&0\\1&0&16&0&24&0&63&63&0&52&0&138&0&0&294\\5&0&24&0&20&0&63&99&0&56&0&154&0&0&358\\0&12&0&21&0&86&0&0&143&0&67&0&222&347&0\\0&0&9&0&23&0&52&56&0&67&0&126&0&0&302\\0&7&0&10&0&48&0&0&67&0&43&0&111&170&0\\2&0&34&0&56&0&138&154&0&126&0&334&0&0&710\\0&16&0&36&0&140&0&0&222&0&111&0&380&561&0\\0&27&0&50&0&212&0&0&347&0&170&0&561&877&0\\6&0&70&0&98&0&294&358&0&302&0&710&0&0&1712\end{bmatrix}$

$\ \ \ \mathrm{E}\left[\chi_i^2\right] = \begin{bmatrix}1&3&9&6&15&62&63&99&143&67&43&334&380&877&1712&862&893&2082&1802&515\end{bmatrix}$

Event probabilities

$-$$a_2\in\mathbb{Z}$$a_2=-1$$a_2=0$$a_2=1$$a_2=2$$a_2=3$
$-$$1$$1/2$$0$$0$$0$$0$$1/2$
$a_1=0$$3/8$$1/4$$0$$0$$0$$0$$1/4$
$a_3=0$$3/8$$1/4$$0$$0$$0$$0$$1/4$
$a_1=a_3=0$$3/8$$1/4$$0$$0$$0$$0$$1/4$