Romanyuk, A. S.; Romanyuk, V. S. Approximating characteristics of the classes of periodic multivariate functions in the space \(B_{ \infty , 1} \). (English. Ukrainian original) Zbl 1436.42005 Ukr. Math. J. 71, No. 2, 308-321 (2019); translation from Ukr. Mat. Zh. 71, No. 2, 271-282 (2019). MSC: 42A10 41A46 PDFBibTeX XMLCite \textit{A. S. Romanyuk} and \textit{V. S. Romanyuk}, Ukr. Math. J. 71, No. 2, 308--321 (2019; Zbl 1436.42005); translation from Ukr. Mat. Zh. 71, No. 2, 271--282 (2019) Full Text: DOI
Vakarchuk, S. B. On the estimates of widths of the classes of functions defined by the generalized moduli of continuity and majorants in the weighted space \(L_{2,x}(0, 1)\). (English. Russian original) Zbl 1435.41029 Ukr. Math. J. 71, No. 2, 202-214 (2019); translation from Ukr. Mat. Zh. 71, No. 2, 179-189 (2019). MSC: 41A46 46E35 PDFBibTeX XMLCite \textit{S. B. Vakarchuk}, Ukr. Math. J. 71, No. 2, 202--214 (2019; Zbl 1435.41029); translation from Ukr. Mat. Zh. 71, No. 2, 179--189 (2019) Full Text: DOI
Shvai, K. V. Estimation of the best bilinear approximations for the classes of \((\psi, \beta)\)-differentiable periodic multivariable functions. (English. Ukrainian original) Zbl 1429.41028 Ukr. Math. J. 70, No. 4, 649-660 (2018); translation from Ukr. Mat. Zh. 70, No. 4, 564-573 (2018). Reviewer: Francisco Pérez Acosta (La Laguna) MSC: 41A50 PDFBibTeX XMLCite \textit{K. V. Shvai}, Ukr. Math. J. 70, No. 4, 649--660 (2018; Zbl 1429.41028); translation from Ukr. Mat. Zh. 70, No. 4, 564--573 (2018) Full Text: DOI
Shkapa, V. V. Approximating characteristics of the classes \(L_{\beta,p}^\psi\) of periodic functions in the space \(L_q\). (English. Ukrainian original) Zbl 1380.42002 Ukr. Math. J. 67, No. 8, 1283-1295 (2016); translation from Ukr. Mat. Zh. 67, No. 8, 1139-1150 (2015). MSC: 42A10 PDFBibTeX XMLCite \textit{V. V. Shkapa}, Ukr. Math. J. 67, No. 8, 1283--1295 (2016; Zbl 1380.42002); translation from Ukr. Mat. Zh. 67, No. 8, 1139--1150 (2015) Full Text: DOI
Romanyuk, A. S. On the problem of linear widths of the classes \(B_{p,\theta}^r\) of periodic functions of many variables. (English. Ukrainian original) Zbl 1309.41014 Ukr. Math. J. 66, No. 7, 1085-1098 (2014); translation from Ukr. Mat. Zh. 66, No. 7, 970-982 (2014). MSC: 41A46 42A10 PDFBibTeX XMLCite \textit{A. S. Romanyuk}, Ukr. Math. J. 66, No. 7, 1085--1098 (2014; Zbl 1309.41014); translation from Ukr. Mat. Zh. 66, No. 7, 970--982 (2014) Full Text: DOI
Akishev, G. Trigonometric widths of the Nikol’skii-Besov classes in the Lebesgue space with mixed norm. (English. Ukrainian original) Zbl 1311.42013 Ukr. Math. J. 66, No. 6, 807-817 (2014); translation from Ukr. Mat. Zh. 66, No. 6, 723-732 (2014). MSC: 42B05 46E30 PDFBibTeX XMLCite \textit{G. Akishev}, Ukr. Math. J. 66, No. 6, 807--817 (2014; Zbl 1311.42013); translation from Ukr. Mat. Zh. 66, No. 6, 723--732 (2014) Full Text: DOI
Derev’yanko, N. V. Trigonometric widths of classes of periodic functions of many variables. (English) Zbl 1270.42002 Ukr. Math. J. 64, No. 8, 1185-1198 (2013); translation from Ukr. Mat. Zh. 64, No. 8, 1041-1052 (2012). MSC: 42A10 42B05 PDFBibTeX XMLCite \textit{N. V. Derev'yanko}, Ukr. Math. J. 64, No. 8, 1185--1198 (2013; Zbl 1270.42002); translation from Ukr. Mat. Zh. 64, No. 8, 1041--1052 (2012) Full Text: DOI
Solich, K. V. Estimates for bilinear approximations of the classes \(S_{p,\theta}^\Omega B\) of periodic functions of two variables. (English) Zbl 1281.41015 Ukr. Math. J. 64, No. 8, 1260-1276 (2013); translation from Ukr. Mat. Zh. 64, No. 8, 1106-1120 (2012). Reviewer: Richard A. Zalik (Auburn) MSC: 41A50 41A65 PDFBibTeX XMLCite \textit{K. V. Solich}, Ukr. Math. J. 64, No. 8, 1260--1276 (2013; Zbl 1281.41015); translation from Ukr. Mat. Zh. 64, No. 8, 1106--1120 (2012) Full Text: DOI
Romanyuk, A. S.; Romanyuk, V. S. Best bilinear approximations of functions from Nikol’skii-Besov classes. (English. Russian original) Zbl 1257.41015 Ukr. Math. J. 64, No. 5, 781-796 (2012); translation from Ukr. Mat. Zh. 64, No. 5, 685-697 (2012). MSC: 41A50 PDFBibTeX XMLCite \textit{A. S. Romanyuk} and \textit{V. S. Romanyuk}, Ukr. Math. J. 64, No. 5, 781--796 (2012; Zbl 1257.41015); translation from Ukr. Mat. Zh. 64, No. 5, 685--697 (2012) Full Text: DOI
Vakarchuk, S. B. On the diameters of some classes of analytic functions. I. (English. Russian original) Zbl 0788.30040 Ukr. Math. J. 44, No. 3, 283-291 (1992); translation from Ukr. Mat. Zh. 44, No. 3, 324-333 (1992). MSC: 30H05 30E10 30D55 PDFBibTeX XMLCite \textit{S. B. Vakarchuk}, Ukr. Math. J. 44, No. 3, 283--291 (1992; Zbl 0788.30040); translation from Ukr. Mat. Zh. 44, No. 3, 324--333 (1992) Full Text: DOI
Bokhonov, Yu. E. Self-adjoint extensions of commuting Hermitian operators. (English. Russian original) Zbl 0716.47011 Ukr. Math. J. 42, No. 5, 614-616 (1990); translation from Ukr. Mat. Zh. 42, No. 5, 695-697 (1990). Reviewer: M.Martin MSC: 47B15 47B38 47A20 PDFBibTeX XMLCite \textit{Yu. E. Bokhonov}, Ukr. Math. J. 42, No. 5, 614--616 (1990; Zbl 0716.47011); translation from Ukr. Mat. Zh. 42, No. 5, 695--697 (1990) Full Text: DOI
Ostrovskij, V. L.; Samojlenko, Yu. S. An application of the projective spectral theorem to commuting families of operators. (English. Russian original) Zbl 0708.47001 Ukr. Math. J. 40, No. 4, 404-414 (1988); translation from Ukr. Mat. Zh. 40, No. 4, 469-481 (1988). MSC: 47A10 47B25 47A70 PDFBibTeX XMLCite \textit{V. L. Ostrovskij} and \textit{Yu. S. Samojlenko}, Ukr. Math. J. 40, No. 4, 404--414 (1988; Zbl 0708.47001); translation from Ukr. Mat. Zh. 40, No. 4, 469--481 (1988) Full Text: DOI
Bokhonov, Yu. E. Commuting self-adjoint extensions of systems of Hermitean operators. (English. Russian original) Zbl 0666.47001 Ukr. Math. J. 40, No. 2, 124-127 (1988); translation from Ukr. Mat. Zh. 40, No. 2, 149-153 (1988). Reviewer: V.Suchankova Marsikova MSC: 47A20 47B15 47B25 46M05 PDFBibTeX XMLCite \textit{Yu. E. Bokhonov}, Ukr. Math. J. 40, No. 2, 124--127 (1988; Zbl 0666.47001); translation from Ukr. Mat. Zh. 40, No. 2, 149--153 (1988) Full Text: DOI
Kochubej, A. N. Self-adjointness of a differential operator with unbounded singular operator coefficient. (English) Zbl 0369.34025 Ukr. Math. J. 28(1976), 350-357 (1977). MSC: 34G99 47E05 PDFBibTeX XMLCite \textit{A. N. Kochubej}, Ukr. Math. J. 28, 350--357 (1977; Zbl 0369.34025) Full Text: DOI
Gorbachuk, V. I.; Gorbachuk, M. L. Some questions of the spectral theory of differential equations of elliptic type in the space of vector-functions. (English) Zbl 0344.34018 Ukr. Math. J. 28(1976), 244-252 (1977). MSC: 34L99 34G99 PDFBibTeX XMLCite \textit{V. I. Gorbachuk} and \textit{M. L. Gorbachuk}, Ukr. Math. J. 28, 244--252 (1977; Zbl 0344.34018) Full Text: DOI
Kochubej, A. N. The spectrum of non-self-adjoint perturbations of abstract differential operators. (English) Zbl 0328.34019 Ukr. Math. J. 27(1975), 550-551 (1976). MSC: 34L99 47E05 34G99 PDFBibTeX XMLCite \textit{A. N. Kochubej}, Ukr. Math. J. 27, 550--551 (1976; Zbl 0328.34019) Full Text: DOI
Berezanskiĭ, Yu. M.; Gali, I. M. Positive definite functions of infinitely many variables in a layer. (English) Zbl 0255.46038 Ukr. Math. J. 24(1972), 351-372 (1973). MSC: 46G99 28C20 PDFBibTeX XMLCite \textit{Yu. M. Berezanskiĭ} and \textit{I. M. Gali}, Ukr. Math. J. 24, 351--372 (1973; Zbl 0255.46038) Full Text: DOI
Berezanskiĭ, Yu. M.; Shifrin, S. N. The generalized degree symmetric moment problem. (English) Zbl 0229.46058 Ukr. Math. J. 23 (1971), 247-258 (1972). MSC: 46M05 46A11 PDFBibTeX XMLCite \textit{Yu. M. Berezanskiĭ} and \textit{S. N. Shifrin}, Ukr. Math. J. 23, 247--258 (1972; Zbl 0229.46058) Full Text: DOI