Line Congruences on singular surfaces

Débora Lopes, Tito Alexandro Medina Tejeda, Maria Aparecida Soares Ruas +1

This paper is a first step in order to extend Kummer's theory for line congruences to the case $\{x,\xi \}$, where $x:U\to {\mathbb{R}}^3$ is a smooth map and $ξ:…