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 The theorem on preservation of domain for certain elliptic systems of differential equations and its applicationsG. M. Polozhii 485 On properties of differentiable mappings of regions of Euclidian spacesL. D. Kudryavtsev 493 Separability and nonseparability of $R$-setsA. A. Lyapunov 515 On solutions on a time half-line of differential equations with small multipliers of the derivativesI. S. Gradshtein 533 The theory of generalized heaps and generalized groupsV. V. Vagner 545 On some classes of analytic functions univalent in a circular ringV. A. Zmorovich 633 Differentiability of solutions of certain problems of potential theoryA. I. Koshelev 653 The existence of characteristic functions for nonlinear integral operators with nonpositive kernels and for the product of self-adjoint and potential operatorsM. M. Vainberg 665 Infinitesimal deformations of troughsÈ. G. Poznyak 681 On the possibility of capture in the problem of three bodiesK. A. Sitnikov 693