Leo A. Aroian, The Probability Function of the Product of Two Normally Distributed Variables, The Annals of Mathematical Statistics, Vol. 18, No. 2 (Jun., 1947), pp. 265-271 ...

Jim Agler, John E. McCarthy, N. J. Young, Operator monotone functions and Löwner functions of several variables, Annals of Mathematics, Second Series, Vol. 176, No ...

Functions of Two Variables Functions of two variables can be visualized in many ways: heat maps in 2D, contour curves in 2D, wireframes in 3D, surfaces in 3D. We begin by defining a function of two ...

Positive correlation is a relationship between two variables in which both variables move in tandem.