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    <item>
      <title>V. G. Georgii Mykolaiovych Polozhyi (on his 90th birthday)</title>
      <pubDate>Tue, 24 Mar 2026 02:48:34 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3776</link>
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      <title>A goodness-of-fit test for a polynomial errors-in-variables model</title>
      <pubDate>Tue, 24 Mar 2026 02:48:33 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3774</link>
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      <author>Cheng, C.-L.</author>
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      <title>Congruences on ternary semigroups</title>
      <pubDate>Tue, 24 Mar 2026 02:48:33 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3775</link>
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      <author>Chronowski, A.</author>
      <dc:format>Стаття</dc:format>
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      <title>On the relation between fourier and leont’ev coefficients with respect to smirnov spaces</title>
      <pubDate>Tue, 24 Mar 2026 02:48:32 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3773</link>
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      <author>Forster, B.</author>
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      <title>Regularity of a boundary point for singular parabolic equations with measurable coefficients</title>
      <pubDate>Tue, 24 Mar 2026 02:48:31 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3772</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3772</guid>
      <author>Skrypnik, I. I.</author>
      <dc:format>Стаття</dc:format>
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    <item>
      <title>On some properties of bundles of trajectories of a controlled bilinear inclusion</title>
      <pubDate>Tue, 24 Mar 2026 02:48:30 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3770</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3770</guid>
      <author>Komleva, T. A.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>Approximation of infinitely differentiable periodic functions by interpolation trigonometric polynomials</title>
      <pubDate>Tue, 24 Mar 2026 02:48:30 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3771</link>
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      <author>Serdyuk, A. S.</author>
      <dc:format>Стаття</dc:format>
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      <title>Estimates of groups of deviations of faber sums and strong summability of faber series on classes of ψ-integrals</title>
      <pubDate>Tue, 24 Mar 2026 02:48:28 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3767</link>
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      <title>Stability of positive and monotone systems in a partially ordered space</title>
      <pubDate>Tue, 24 Mar 2026 02:48:28 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3768</link>
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      <author>Mazko, A. G.</author>
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      <title>Generalized two-parameter Lebesgue-Stieltjes integrals and their applications to fractional Brownian fields</title>
      <pubDate>Tue, 24 Mar 2026 02:48:26 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3766</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3766</guid>
      <author>Il&amp;#039;chenko, S. A.</author>
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      <title>Malmquist theorem for solutions of differential equations in a neighborhood of a logarithmic singular point</title>
      <pubDate>Tue, 24 Mar 2026 02:48:26 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3769</link>
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      <title>Interpolation Sequences for the Class of Functions of Finite η-Type Analytic in the Unit Disk</title>
      <pubDate>Tue, 24 Mar 2026 02:48:24 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3765</link>
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      <author>Vynnyts’kyi, B. V.</author>
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    <item>
      <title>Euler Approximations of Solutions of Abstract Equations and Their Applications in the Theory of Semigroups</title>
      <pubDate>Tue, 24 Mar 2026 02:48:23 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3762</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3762</guid>
      <author>Mishura, Yu. S.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>On the Discreteness of the Structural Space of Weakly Completely Continuous Banach Algebras</title>
      <pubDate>Tue, 24 Mar 2026 02:48:23 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3763</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3763</guid>
      <author>Mustafaev, G. S.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>On the Decomposition of an Operator into a Sum of Four Idempotents</title>
      <pubDate>Tue, 24 Mar 2026 02:48:23 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3764</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3764</guid>
      <author>Rabanovych, V. I.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Rabanovych, V. I.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Boundary Functionals of a Semicontinuous Process with Independent Increments on an Interval</title>
      <pubDate>Tue, 24 Mar 2026 02:48:21 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3761</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3761</guid>
      <author>Kadankova, T. V.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Kadankova, T. V.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Nevanlinna–Pick Problem for Stieltjes Matrix Functions</title>
      <pubDate>Tue, 24 Mar 2026 02:48:20 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3760</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3760</guid>
      <author>Dyukarev, Yu. M.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Dyukarev, Yu. M.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>BCS Model Hamiltonian of the Theory of Superconductivity as a Quadratic Form</title>
      <pubDate>Tue, 24 Mar 2026 02:48:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3756</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3756</guid>
      <author>Petrina, D. Ya.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Petrina, D. Ya.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>On Permutable Congruences on Antigroups of Finite Rank</title>
      <pubDate>Tue, 24 Mar 2026 02:48:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3758</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3758</guid>
      <author>Derech, V. D.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Derech, V. D.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Coconvex Approximation of Functions with More than One Inflection Point</title>
      <pubDate>Tue, 24 Mar 2026 02:48:19 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3759</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3759</guid>
      <author>Dzyubenko, H. A.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Dzyubenko, H. A.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>On the Optimal Coefficient of Efficiency of a Semi-Markov System in the Scheme of Phase Lumping</title>
      <pubDate>Tue, 24 Mar 2026 02:48:17 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3757</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3757</guid>
      <author>Vovkodav, N. G.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Vovkodav, N. G.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>Creative Contribution of D. Ya. Petrina to the Development of Contemporary Mathematical Physics</title>
      <pubDate>Tue, 24 Mar 2026 02:48:15 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3755</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3755</guid>
      <author>Gerasimenko, V. I.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Gerasimenko, V. I.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>On Some Spectral Properties of the Energy Operator for an Infinite System in a Magnetic Field</title>
      <pubDate>Tue, 24 Mar 2026 02:48:14 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3753</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3753</guid>
      <author>Samoilenko, V. G.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Samoilenko, V. G.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Dmytro Yakovych Petryna
(on his 70 th birthday)</title>
      <pubDate>Tue, 24 Mar 2026 02:48:13 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3754</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3754</guid>
      <author>Gorbachuk, M. L.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Gorbachuk, M. L.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Plane Closed Trajectories on Certain Manifolds with Rotation Metric</title>
      <pubDate>Tue, 24 Mar 2026 02:48:12 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3752</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3752</guid>
      <author>Romanov, S. S.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Romanov, S. S.</dc:creator>
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      <title>Critical Cases of the π-Stability of a Nonautonomous Quasilinear Equation of the nth Order</title>
      <pubDate>Tue, 24 Mar 2026 02:48:11 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3750</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3750</guid>
      <author>Vitrychenko, I. E.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Vitrychenko, I. E.</dc:creator>
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    <item>
      <title>Structure of Binary Darboux-Type Transformations for Hermitian Adjoint Differential Operators</title>
      <pubDate>Tue, 24 Mar 2026 02:48:10 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3751</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3751</guid>
      <author>Prykarpatsky, A. K.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Prykarpatsky, A. K.</dc:creator>
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    <item>
      <title>Boundedness of the l-Index of the Naftalevich–Tsuji Product</title>
      <pubDate>Tue, 24 Mar 2026 02:48:09 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3748</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3748</guid>
      <author>Trukhan, Yu.S.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Trukhan, Yu.S.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Averaging of Oscillation Systems with Delay and Integral Boundary Conditions</title>
      <pubDate>Tue, 24 Mar 2026 02:48:09 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3749</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3749</guid>
      <author>Bigun, Ya. I.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Bigun, Ya. I.</dc:creator>
      <slash:comments>0</slash:comments>
    </item>
    <item>
      <title>On Starting Control of Vibrations of a String</title>
      <pubDate>Tue, 24 Mar 2026 02:48:08 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3746</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3746</guid>
      <author>Tukhtasinov, M.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Tukhtasinov, M.</dc:creator>
      <slash:comments>0</slash:comments>
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    <item>
      <title>Additive Functions and Chain Complexes of Projective Modules
</title>
      <pubDate>Tue, 24 Mar 2026 02:48:08 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3747</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3747</guid>
      <author>Sharko, V. V.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Sharko, V. V.</dc:creator>
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    <item>
      <title>Scattering Problem for a Wave Equation with Absorption</title>
      <pubDate>Tue, 24 Mar 2026 02:48:05 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3745</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3745</guid>
      <author>Tarasova, E. V.</author>
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      <dc:date>2004</dc:date>
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    <item>
      <title>Bernstein-Type Theorems and Uniqueness Theorems</title>
      <pubDate>Tue, 24 Mar 2026 02:48:04 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3743</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3743</guid>
      <author>Logvinenko, V.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
      <dc:creator>Logvinenko, V.</dc:creator>
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    <item>
      <title>Essentially Infinite-Dimensional Evolution Equations</title>
      <pubDate>Tue, 24 Mar 2026 02:48:04 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3744</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3744</guid>
      <author>Mal&amp;#039;tsev, A. Yu.</author>
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      <dc:date>2004</dc:date>
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      <title>Correct Solvability of the Cauchy Problem for One Equation of Integral Form</title>
      <pubDate>Tue, 24 Mar 2026 02:48:03 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3742</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3742</guid>
      <author>Litovchenko, V. A.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>Asymptotically Well-Posed Boundary-Value Problems</title>
      <pubDate>Tue, 24 Mar 2026 02:48:01 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3741</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3741</guid>
      <author>Kengne, E.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>Finite-Dimensional Nonlocal Reductions of the Inverse Korteweg–de Vries Dynamical System</title>
      <pubDate>Tue, 24 Mar 2026 02:48:00 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3740</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3740</guid>
      <author>Vorobyova, O. V.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>Anatolii Mykhailovych Samoilenko is a member of the European Academy of Sciences</title>
      <pubDate>Tue, 24 Mar 2026 02:47:59 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3738</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3738</guid>
      <author>EditorialBoard</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>Perturbation Method for a Parabolic Equation with Drift on a Riemannian Manifold</title>
      <pubDate>Tue, 24 Mar 2026 02:47:59 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3739</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3739</guid>
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      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>On Saturation of Linear Summation Methods for Fourier Series in the Spaces $S_{\varphi} ^p$</title>
      <pubDate>Tue, 24 Mar 2026 02:47:58 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3736</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3736</guid>
      <author>Shydlich, A. L.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>Systems of Differential Inequalities with Initial Time Difference</title>
      <pubDate>Tue, 24 Mar 2026 02:47:58 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3737</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3737</guid>
      <author>Jankowski, T.</author>
      <dc:format>Стаття</dc:format>
      <dc:date>2004</dc:date>
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    <item>
      <title>The Best $m$-Term Trigonometric Approximations of the Classes $L_{\beta ,p}^\Psi$ in Uniform Metric</title>
      <pubDate>Tue, 24 Mar 2026 02:47:56 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3735</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3735</guid>
      <author>Fedorenko, A. S.</author>
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      <dc:date>2004</dc:date>
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    <item>
      <title>Convolutions of Singular Distribution Functions</title>
      <pubDate>Tue, 24 Mar 2026 02:47:55 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3733</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3733</guid>
      <author>Vynnyshyn, Ya. F.</author>
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      <dc:date>2004</dc:date>
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    <item>
      <title>Second Jackson Inequality in a Sign-Preserving Approximation of Periodic Functions</title>
      <pubDate>Tue, 24 Mar 2026 02:47:54 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3734</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3734</guid>
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      <dc:date>2004</dc:date>
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      <title>Qualitative Investigation of Discontinuous Dynamical Systems on a Plane by the Method of Pointwise Mappings</title>
      <pubDate>Tue, 24 Mar 2026 02:47:53 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3732</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3732</guid>
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      <dc:date>2004</dc:date>
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    <item>
      <title>Approximation of Poisson Integrals by de la Vallée Poussin Sums</title>
      <pubDate>Tue, 24 Mar 2026 02:47:52 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3731</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3731</guid>
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      <dc:date>2004</dc:date>
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    <item>
      <title>Hopf Algebras and Integrable Flows Related to the Heisenberg–Weil Coalgebra</title>
      <pubDate>Tue, 24 Mar 2026 02:47:50 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3730</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3730</guid>
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      <dc:date>2004</dc:date>
      <dc:creator>Blackmore, D.</dc:creator>
      <slash:comments>0</slash:comments>
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      <title>On the Approximation by Modified Interpolation Polynomials in Spaces $L_p$</title>
      <pubDate>Tue, 24 Mar 2026 02:47:49 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3728</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3728</guid>
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      <dc:date>2004</dc:date>
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      <title>On the Smoothness of a Generalized Solution of the First Initial Boundary-Value Problem for Strongly Parabolic Systems in a Cylinder with Nonsmooth Base with Respect to Time Variable</title>
      <pubDate>Tue, 24 Mar 2026 02:47:49 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3729</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3729</guid>
      <author>Nguyen, Manh Hung</author>
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      <dc:date>2004</dc:date>
      <dc:creator>Nguyen, Manh Hung</dc:creator>
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      <title>Estimate for the Best Approximation of Summable Functions of Two Variables in Terms of Fourier Coefficients</title>
      <pubDate>Tue, 24 Mar 2026 02:47:48 +0000</pubDate>
      <link>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3727</link>
      <guid>https://harvester.nas.gov.ua/Record/umjimathkievua-article-3727</guid>
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