Superposition in the p-Laplace equation

That a superposition of fundamental solutions to the p-Laplace Equation is p-superharmonic-even in the non-linear cases p>2-has been known since M. Crandall and J. Zhang published their paper Another Way to Say Harmonic in 2003. We give a simple proof and extend the result by means of an explicit formula for the p-Laplacian of the superposition.