(n) :
a construction in which each point in a Euclidean space is associated with a vector; a function whose range is a vector space; a function which associates, to each point on a surface, a vector in the tangent plane of that point
(n) :
a construction in which each point in a Euclidean space is associated with a vector; a function whose range is a vector space; a function which associates, to each point on a surface, a vector in the tangent plane of that point