We determine the general solution of the functional equation $f(x + y) + f(x - y) = A(y)f(x)\quad (x, y \in G),$ where G is a 2-divisible abelian group, f is a vector ...

Any vector can be expressed as a sum of a number of other vectors. The vectors which are summed are called the components of the original vector. When you want to add and subtract two dimensional ...

IN this volume the vector equation of mass acceleration commonly known as Newton's laws is applied to the “law of areas,” the problems of harmonic and oscillatory motion, the brachistochrone, motion ...