2 problems

Let a finite group $G$ be completely $D$-realisable if there is a group $H$ such that, up to isomorphism, … where $L(G)$ denotes the subgroup lattice of $G$. The group $A_4$ is the…

Let $G$ be a Chevalley group and let $S$ be a sufficiently large subsystem subgroup of $G$. The subgroups of $G$ containing $S$ form a lattice. Vavilov's sandwich-classification co…