2 papers
math.DG2026
Basic invariants for time-like surfaces in with real asymptotic lines
Ognian Kassabov
The geometrically defined wide class of time-like surfaces in , admitting real asymptotic lines is considered. A fundamental theorem of Bonnet-type is obtained for the…
math.DG2025
Canonical parameters on a surface in
Ognian Kassabov, Velichka Milousheva
In the present paper, we study surfaces in the four-dimensional Euclidean space . We define special principal parameters, which we call canonical, on each surface wit…