ORTHOGONALITY AND LEAST SQUARES
Orthogonal Vectors Norm Unit Vector Orthonormal Vectors Orthogonal Complement Orthogonal Projection Cauchy-Schwarz Inequality Angle Between Two Vectors Gram-Schmidt Process QR Factorialization Transpose Symmetric and Skew-symmetric Matrices Orthogonal Matrices Least Squares Solutions Matrix of an Orthogonal Projection	Angle Between Two Vectors How to Examples Exercise How to: A consequence of the Cauchy-Schwarz inequality is that we are able to calculate the angle, alpha, between two vectors:      alpha = arccos(dot(x, y)/(norm(x)*norm(y)))      Examples: Exercise: