Focal surfaces of wave fronts in the Euclidean 3-space
arXiv:1804.06123 · doi:10.1017/S0017089518000277
Abstract
We characterize singularities of focal surfaces of wave fronts in terms of differential geometric properties of the initial wave fronts. Moreover, we study relationships between geometric properties of focal surfaces and geometric invariants of the initial wave fronts.
12 pages, 2 figures