We remark that when n=1 in the definition of a subharmonic function, it is the same as the standard definition of a convex function of one real variable, where affine linear functions play the rol...We remark that when n=1 in the definition of a subharmonic function, it is the same as the standard definition of a convex function of one real variable, where affine linear functions play the role of harmonic functions: A function of one real variable is convex if for every interval it is less than the affine linear function with the same end points.