Isotropic submanifolds of $T{\mathbb{S}}^n$ and their focal sets

Nikos Georgiou, Brendan Guilfoyle, Morgan Robson

Families of oriented lines in ${\mathbb{R}}^{n+1}$ are studied via their identification with submanifolds of $T{\mathbb{S}}^n$. In particular, families of oriented lines which are orth…