2 problems

All groups considered are finite. Let $\mathfrak{U}$ denote the formation of all supersoluble groups, and let $\mathfrak{F}$ be a saturated formation containing $\mathfrak{U}$. For…

A lattice-formation is a formation arising as a lattice in the relevant formation-theoretic setting, and a formation is N-closed when it is closed under taking normal subgroups. La…