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 On the Dirichlet problem for equations of elliptic typeO. A. Oleinik 3 On a property of line integralsV. S. Fedorov 15 On the mixed second derivativeG. P. Tolstov 27 Unitary-differential geometry of families of $K_m$ in $K_n$B. A. Rozenfel'd 53 Conformal interpretation of a Weyl spaceA. P. Norden 75 On certain transformations of summation formulasS. I. Rappoport 87 On the simplicity of the associative system of singular square matricesN. Sivertseva 101 The symmetry theorem for Hermitian operatorsM. K. Fage 107 On $\delta s$-operations preserving measurability and the property of BaireA. A. Lyapunov 119