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 On the question of extension of multidimensional variational problemsF. V. Guseinov 3 On $TI$-subgroups of finite groupsA. A. Makhnev 22 On a boundary value problem for the time-dependent Stokes system with general boundary conditionsI. Sh. Mogilevskii 37 The number of integers representable as a sum of two squares on small intervalsV. A. Plaksin 67 Prime algebras and absolute zero divisorsS. V. Pchelintsev 79 Classification of periodic functions and the rate of convergence of their Fourier seriesA. I. Stepanets 101 Approximation of periodic functions of several variables by bilinear formsV. N. Temlyakov 137 Noncompact absolute extensors in dimension $n$, $n$-soft mappings, and their applicationsA. Ch. Chigogidze 156 On a generalization of canonical quantizationA. S. Kholevo 181 The Radon–Penrose transformation for the group $SO(8)$, and instantonsYu. I. Manin, Hoàng Lê Minh 195