Total variation flow and sign fast diffusion in one dimension. (English) Zbl 1242.35049
Summary: We consider the dynamics of the total variation flow (TVF) \(u_t = \operatorname{div} (Du/|Du|)\) and of the sign fast diffusion equation (SFDE) \(u_t = \Delta \operatorname{sign}(u)\) in one spatial dimension. We find the explicit dynamic and sharp asymptotic behaviour for the TVF, and we deduce the one for the SFDE by an explicit correspondence between the two equations.
MSC:
| 35B40 | Asymptotic behavior of solutions to PDEs |
| 35K59 | Quasilinear parabolic equations |
| 35K67 | Singular parabolic equations |
| 35K92 | Quasilinear parabolic equations with \(p\)-Laplacian |
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