| Contents |
| We will first shortly review the informal derivation of a continuum limit for the Bak-Tang-Wiesenfeld model of self-organized criticality. This will lead to the stochastic sign fast diffusion equation. A key property of models exhibiting self-organized criticality is the relaxation of supercritical states into critical ones in finite time. However, it has remained an open question for several years whether the continuum limit - the stochastic sign fast diffusion - satisfies this relaxation in finite time. We will present a proof of this. |
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