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TITLE: [GS_M_APP] Regular boundary points and the Dirichlet problem for elliptic equations in double divergence form

ABSTRACT: We study the Dirichlet problem for a second-order elliptic operator $L^*$ in double divergence form, also known as the stationary Fokker--Planck--Kolmogorov equation. Assuming that the leading coefficients have Dini mean oscillation, we establish the equivalence between regular boundary points for the operator $L^*$ and those for the Laplace operator, as characterized by the classical Wiener criterion.