smoothness of f does not depend on the choice of local ___
parametrisation
a ___ of the surface is a smooth map which assigns to every point p a unit normal vector N(p)
gauss map
a gauss map of a regular surface ca always be defined in a ___ of any p
neighbourhood
a surface is called ___ is there exists a ___ Gauss map
orientable/global
local isometries preserve:
-___ and ___ of vectors
-___ between vectors and curves
-___ of curves
norms/inner products/angles/lengths
Global isometries preserve:
-local isometries
-___
-___
distances/areas