The Laplacian on the level 3 Sierpinski gasket via the method of averages

In this paper, we show how the symmetric Laplacian on the level 3 Sierpinski gasket, together with its associated Dirichlet form and harmonic functions, can be defined entirely in terms of average values of a function over basic sets. The approach combined the constructive limit-of-difference-quotients method of Kigami and the method of averages introduced by Kusuoka and Zhou for the Sierpinski carpet.