Invariants
| Weight: | $1$ |
| Degree: | $2$ |
| $\mathbb{R}$-dimension: | $1$ |
| Components: | $1$ |
| Contained in: | $\mathrm{USp}(2)$ |
| Rational: | yes |
Identity component
| Name: | $\mathrm{U}(1)$ | ||
| Index: | $1$ | ||
| $\mathbb{R}$-dimension: | $1$ | ||
| Description: | $\left\{\begin{bmatrix}\alpha&0\\0&\bar\alpha\end{bmatrix}:\alpha\bar\alpha = 1,\ \alpha\in\mathbb{C}\right\}$ | Symplectic form: | $\begin{bmatrix}0&1\\-1&0\end{bmatrix}$ |
| Hodge circle: | $u\mapsto\mathrm{diag}(u,\bar u)$ |
Subgroups and supergroups
| Maximal subgroups: | |
| Minimal supergroups: | $N(\mathrm{U}(1))$ |
Moment sequences
| $x$ | $\mathrm{E}[x^{0}]$ | $\mathrm{E}[x^{1}]$ | $\mathrm{E}[x^{2}]$ | $\mathrm{E}[x^{3}]$ | $\mathrm{E}[x^{4}]$ | $\mathrm{E}[x^{5}]$ | $\mathrm{E}[x^{6}]$ | $\mathrm{E}[x^{7}]$ | $\mathrm{E}[x^{8}]$ | $\mathrm{E}[x^{9}]$ | $\mathrm{E}[x^{10}]$ | $\mathrm{E}[x^{11}]$ | $\mathrm{E}[x^{12}]$ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| $a_1$ | $1$ | $0$ | $2$ | $0$ | $6$ | $0$ | $20$ | $0$ | $70$ | $0$ | $252$ | $0$ | $924$ |