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 For the first place in the world science 465 On conjugate double trigonometric seriesI. E. Zhak 469 On an estimate of the error in approximate solution of a finite-difference Poisson equationN. D. Aizenshtat 485 On the central series of infinite groupsV. M. Glushkov 491 On some properties of matrices with positive elementsD. M. Kotelyanskii 497 On some problems of the geometry of prime numbersI. P. Kubilyus 507 On proximity spacesYu. M. Smirnov 543 Systems of differential equations containing small parameters in the derivativesA. N. Tikhonov 575 On differential equations containing small parametersA. B. Vasil'eva 587 On the theory of nonlinear differential equations of higher orders with a small parameter in the highest derivativeV. M. Volosov 645 On solutions of some differential equations of the second order depending upon a parameterV. M. Volosov 675 On primitive functions and trigonometric series converging almost everywhereN. K. Bari 687 On equations of elliptic and parabolic type with a small parameter in the highest derivativesS. L. Kamenomostskaya 703 On a boundary problem for the equation $\varepsilon y-F(x,y,y')$ for small $\varepsilon$O. A. Oleinik, A. I. Zhizhina 709