Fully nonlinear parabolic fixed transmission problems
Abstract
We consider transmission problems for parabolic equations governed by distinct fully nonlinear operators on each side of a time-dependent interface. We prove that if the interface is C1,α, in the parabolic sense, then viscosity solutions are piecewise C1,α up to the interface. As byproducts, we obtain a new ABP-Krylov-Tso estimate, and establish existence, uniqueness, a comparison principle, and regularity results for the flat interface problem.
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