LECTURE NOTES Math 2450, Calculus III with Applications Alvaro P´ampano Llarena´ 1 Vectors in Plane and Space (Chapter 9) Definition 1.1The plane can be described as the set, R2 = {(x,y) |x,y∈R}, while the space is the set, R3 = {(x,y,z) |x,y,z∈R}. Both, R2 and R3 are examples of vector and affine spaces.