Новые примеры поверхностей зонтичного типа и их коэффициенты квадратичных форм

New Examples of Umbrella Surfaces and Their Coefficients of General Fundamental Forms

Umbrella shells are used as coverings of civil and industrial buildings. Umbrella surfaces are formed on surfaces of revolution. Several new types of umbrella surfaces are presented in the article. The coefficients of the first (A, F, B) and second (L, M, N) fundamental forms of surface are derived for presented surfaces.