2 problems

Let $V$ be a vector space and let $\mathcal L$ be a series in $V$. Define … where $S(\mathcal L)$ is the stabilizer of $\mathcal L$, and let $H(\mathcal L)$ denote the Hirsch–Plotk…

Let $V$ be an $\mathbb F$-vector space, let $\mathcal L$ be a series in $V$, and let $H(\mathcal L)$ be the Hirsch–Plotkin radical of $S(\mathcal L)$, the stability group of…