Resumen de A note on separation of variables

Yonah Cherniavsky

• We write down very simple, necessary and sufficient conditions for the additive and multiplicative separability of variables: v(x1, x2, � , xn) = g1(x1) + g2(x2) + · · · + gn(xn) or u(x1, x2, � , xn) = f1(x1)f2(x2) · · · fn(xn).