L6A 1. Vector Field 2. Trajectory of a Vector Field 3. Examples: w=(x,y) and w=(y,-x) L6B 1. Theorem: Existence and Uniqueness of the Trajectory of a Vector Field 2. Theorem: Existence of the Local Flow a Vector FieldL6C 1. Ruled Surface, Ruling and Directrix 2. Examples: Plane, Cylinder, Cone and Hyperboloid of Revolution