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3 Granular Material Flows
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Fig. 3.11. A granular (pattern) equilibrium state in a Zen garden in Kyoto, Japan

Fig. 3.12. A stable pile of small pebbles in a Zen garden in Kyoto, Japan. For the modeling of
the growth, collapse and stability of piles of granular materials, in the context of the Monge–
Kantorovich mass transportation theory, using p-Laplace equations we refer to the survey of L. C.
Evans [2] and, for more mathematical detail, to [3]