{"id":3874,"date":"2026-03-08T19:39:12","date_gmt":"2026-03-08T16:39:12","guid":{"rendered":"https:\/\/math.karazin.ua\/?page_id=3874"},"modified":"2026-03-12T22:07:08","modified_gmt":"2026-03-12T19:07:08","slug":"gefter-s-l","status":"publish","type":"page","link":"https:\/\/math.karazin.ua\/en\/gefter-s-l\/","title":{"rendered":"Scientific and pedagogical staff"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"3874\" class=\"elementor elementor-3874\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3485963 e-flex e-con-boxed e-con e-parent\" data-id=\"3485963\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-378099d elementor-position-left elementor-vertical-align-middle elementor-widget elementor-widget-image-box\" data-id=\"378099d\" data-element_type=\"widget\" data-widget_type=\"image-box.default\">\n\t\t\t\t\t<div class=\"elementor-image-box-wrapper\"><figure class=\"elementor-image-box-img\"><img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"988\" src=\"https:\/\/math.karazin.ua\/wp-content\/uploads\/2026\/03\/\u0413\u0435\u0444\u0442\u0435\u0440-768x988.jpg\" class=\"attachment-medium_large size-medium_large wp-image-3877\" alt=\"\" srcset=\"https:\/\/math.karazin.ua\/wp-content\/uploads\/2026\/03\/\u0413\u0435\u0444\u0442\u0435\u0440-768x988.jpg 768w, https:\/\/math.karazin.ua\/wp-content\/uploads\/2026\/03\/\u0413\u0435\u0444\u0442\u0435\u0440-233x300.jpg 233w, https:\/\/math.karazin.ua\/wp-content\/uploads\/2026\/03\/\u0413\u0435\u0444\u0442\u0435\u0440-796x1024.jpg 796w, https:\/\/math.karazin.ua\/wp-content\/uploads\/2026\/03\/\u0413\u0435\u0444\u0442\u0435\u0440.jpg 1000w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure><div class=\"elementor-image-box-content\"><h3 class=\"elementor-image-box-title\">Hefter Serhii Leonidovych<\/h3><p class=\"elementor-image-box-description\">Candidate of Physical and Mathematical Sciences, Associate Professor, Associate Professor (part-time) of the Department of Fundamental Mathematics. Main place of work: B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Senior Researcher of the Department of Function Theory<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0d107c2 e-flex e-con-boxed e-con e-parent\" data-id=\"0d107c2\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-42ce6db elementor-widget elementor-widget-n-accordion\" data-id=\"42ce6db\" data-element_type=\"widget\" data-settings=\"{&quot;default_state&quot;:&quot;all_collapsed&quot;,&quot;max_items_expended&quot;:&quot;one&quot;,&quot;n_accordion_animation_duration&quot;:{&quot;unit&quot;:&quot;ms&quot;,&quot;size&quot;:400,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-accordion.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-accordion\" aria-label=\"Accordion. Open links with Enter or Space, close with Escape, and navigate with Arrow Keys\">\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-7000\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"1\" tabindex=\"0\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-7000\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> \u041d\u0430\u0443\u043a\u043e\u0432\u0430 \u0431\u0456\u043e\u0433\u0440\u0430\u0444\u0456\u044f <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-7000\" class=\"elementor-element elementor-element-5f73624 e-flex e-con-boxed e-con e-child\" data-id=\"5f73624\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-7001\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"2\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-7001\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> \u041d\u0430\u0443\u043a\u043e\u0432\u0456 \u0456\u043d\u0442\u0435\u0440\u0435\u0441\u0438 <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-7001\" class=\"elementor-element elementor-element-8818532 e-con-full e-flex e-con e-child\" data-id=\"8818532\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f8ba165 elementor-widget elementor-widget-text-editor\" data-id=\"f8ba165\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li dir=\"ltr\" role=\"presentation\"><span style=\"font-weight: 400;\">algebraic and arithmetic questions of the theory of differential and difference equations<\/span><\/li><\/ul><h4 dir=\"ltr\" role=\"presentation\">\u041f\u043e\u0441\u0438\u043b\u0430\u043d\u043d\u044f \u043d\u0430 \u0441\u0442\u043e\u0440\u0456\u043d\u043a\u0438 \u0432 \u043d\u0430\u0443\u043a\u043e\u0432\u0438\u0445 \u043c\u0435\u0440\u0435\u0436\u0430\u0445:<\/h4><ul><li><span style=\"font-weight: 400;\">Scopus Author ID: <\/span><a href=\"https:\/\/www.scopus.com\/authid\/detail.uri?authorId=6506698897\"><span style=\"font-weight: 400;\">6506698897<\/span><\/a><\/li><li><a href=\"https:\/\/mathscinet.ams.org\/mathscinet\/MRAuthorID\/218243\">https:\/\/mathscinet.ams.org\/mathscinet\/MRAuthorID\/218243<\/a><\/li><li>Google Scholar:\u00a0<a href=\"https:\/\/scholar.google.com\/citations?hl=uk&amp;user=LMSjSK4AAAAJ&amp;view_op=list_works\">https:\/\/scholar.google.com\/citations?hl=uk&amp;user=LMSjSK4AAAAJ&amp;view_op=list_works<\/a><\/li><li><a href=\"https:\/\/www.mathgenealogy.org\/id.php?id=126070\">https:\/\/www.mathgenealogy.org\/id.php?id=126070<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-7002\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"3\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-7002\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> \u0412\u0438\u043a\u043b\u0430\u0434\u0430\u0446\u044c\u043a\u0438\u0439 \u0434\u043e\u0441\u0432\u0456\u0434 <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-7002\" class=\"elementor-element elementor-element-eb99e76 e-con-full e-flex e-con e-child\" data-id=\"eb99e76\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0e567c3 elementor-widget elementor-widget-text-editor\" data-id=\"0e567c3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><span style=\"font-weight: 400;\">\u041c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u0447\u043d\u0438\u0439 \u0430\u043d\u0430\u043b\u0456\u0437<\/span><\/li><li><span style=\"font-weight: 400;\">Functional Analysis<\/span><\/li><li><span style=\"font-weight: 400;\">Banach algebras and spectral theory<\/span><\/li><li><span style=\"font-weight: 400;\">\u0423\u0437\u0430\u0433\u0430\u043b\u044c\u043d\u0435\u043d\u0456 \u0444\u0443\u043d\u043a\u0446\u0456\u0457<\/span><\/li><li><span style=\"font-weight: 400;\">\u0412\u0441\u0442\u0443\u043f \u0434\u043e \u0442\u0435\u043e\u0440\u0456\u0457 \u043a\u0456\u043b\u0435\u0446\u044c<\/span><\/li><li><span style=\"font-weight: 400;\">Analytic Number Theory<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-7003\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"4\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-7003\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> \u041e\u0431\u0440\u0430\u043d\u0456 \u043d\u0430\u0443\u043a\u043e\u0432\u0456 \u043f\u0443\u0431\u043b\u0456\u043a\u0430\u0446\u0456\u0457 <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-7003\" class=\"elementor-element elementor-element-3d9a458 e-flex e-con-boxed e-con e-child\" data-id=\"3d9a458\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-30505a2 elementor-widget elementor-widget-text-editor\" data-id=\"30505a2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol><li><span style=\"font-weight: 400;\">R. Skurikhin, S. Gefter, E. Karolinsky, Closed equivalence relations on compact spaces and pairs of commutative <\/span><span style=\"font-weight: 400;\">\ud835\udc36<\/span><span style=\"font-weight: 400;\">*-algebras: a categorical approach, Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics, Vol. 102, 2025, p. 57\u201367. DOI: <a href=\"https:\/\/doi.org\/10.26565\/2221-5646-2025-102-04\">https:\/\/doi.org\/10.26565\/2221-5646-2025-102-04<\/a><\/span><\/li><li><span style=\"font-weight: 400;\">Sergiy L. Gefter and Aleksey L. Piven\u2019, Nonlinear<\/span><span style=\"font-weight: 400;\"> Partial Differential Equations in Module of Copolynomials over a Commutative Ring<\/span><span style=\"font-weight: 400;\">, Journal of Mathematical Physics<\/span><i><span style=\"font-weight: 400;\">, <\/span><\/i><span style=\"font-weight: 400;\">Analysis, Geometry. (2025), vol. 21, Issue 3, \u0440. 319-345. \u00a0 \u00a0 <\/span><a href=\"https:\/\/doi.org\/10.15407\/mag21.03.05\"><span style=\"font-weight: 400;\">https:\/\/doi.org\/10.15407\/mag21.03.05<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Sergiy L. Gefter and Aleksey L. Piven\u2019, <\/span><span style=\"font-weight: 400;\">Partial <\/span><span style=\"font-weight: 400;\">Differential<\/span><span style=\"font-weight: 400;\"> Equations in Module of Copolynomials over a Commutative Ring<\/span><span style=\"font-weight: 400;\">, Journal of Mathematical Physics<\/span><i><span style=\"font-weight: 400;\">, <\/span><\/i><span style=\"font-weight: 400;\">Analysis, Geometry. (2025), vol. 21<\/span><i><span style=\"font-weight: 400;\">,<\/span><\/i><span style=\"font-weight: 400;\"> Issue 1, p. 56\u201383. <\/span><a href=\"https:\/\/doi.org\/10.15407\/mag21.01.03\"><span style=\"font-weight: 400;\">https:\/\/doi.org\/10.15407\/mag21.01.03<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Sergiy L. Gefter and Aleksey L. Piven\u2019,<\/span> <span style=\"font-weight: 400;\">Formal functional calculus for copolynomials over a commutative ring<\/span><span style=\"font-weight: 400;\">,\u00a0 <\/span><span style=\"font-weight: 400;\">Algebra and Discrete Mathematics<\/span><i><span style=\"font-weight: 400;\">,<\/span><\/i><span style=\"font-weight: 400;\"> vol. 39, Issue 2, p. 207\u2013224. (2025)\u00a0 <\/span><a href=\"http:\/\/dx.doi.org\/10.12958\/adm2352\"><span style=\"font-weight: 400;\">http:\/\/dx.doi.org\/10.12958\/adm2352<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Sergiy L. Gefter and Aleksey L. Piven\u2019, Some class of nonlinear partial differential equations in the ring of copolynomials over a commutative ring, Front. Appl. Math. Stat. 10:1466569 (2024)<\/span><a href=\"https:\/\/doi.org\/10.3389\/fams.2024.1466569\"> <span style=\"font-weight: 400;\">https:\/\/doi.org\/10.3389\/fams.2024.1466569<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Hefter, S.L., Goncharuk, A.B. Linear Differential Equation with Inhomogeneity in the Form of a Formal Power Series Over a Ring with Non-Archimedean Valuation. Ukr Math J <\/span><b>74<\/b><span style=\"font-weight: 400;\">, 1668\u20131685 (2023).<\/span><a href=\"https:\/\/doi.org\/10.1007\/s11253-023-02163-0\"> <span style=\"font-weight: 400;\">https:\/\/doi.org\/10.1007\/s11253-023-02163-0<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Gefter, S., Goncharuk, A., Piven\u2019, A., Implicit Linear First Order Difference Equations Over Commutative Rings, Springer Proceedings in Mathematics &amp; Statistics, vol. 416. Springer, Cham, (2023), <\/span><span style=\"font-weight: 400;\">P. 199-216. <\/span><a href=\"https:\/\/link.springer.com\/chapter\/10.1007\/978-3-031-25225-9_10\">https:\/\/link.springer.com\/chapter\/10.1007\/978-3-031-25225-9_10<\/a><\/li><li><span style=\"font-weight: 400;\">Gefter, S. L., and O. L. Piven, Differential operators of infinite order in the module of formal generalized functions and in the ring of formal power series, Ukrainian Mathematical Journal, vol. 74, no. 6, July 2022, p. 784 -799. <\/span><a href=\"https:\/\/link.springer.com\/article\/10.1007\/s11253-022-02116-z\"><span style=\"font-weight: 400;\">https:\/\/link.springer.com\/article\/10.1007\/s11253-022-02116-z<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">S.L. Gefter, A.L. Piven\u2019, <\/span><span style=\"font-weight: 400;\">Implicit Linear Nonhomogeneous Difference Equation over \u2124 with a Random Right-Hand Side, Journal of Mathematical Physics, Analysis, Geometry, (2022), <\/span><span style=\"font-weight: 400;\">vol. 18, Issue1, 105\u2013117.<\/span><a href=\"https:\/\/jmag.ilt.kharkov.ua\/jmag\/pdf\/18\/jm18-0105e.pdf\"><span style=\"font-weight: 400;\">https:\/\/jmag.ilt.kharkov.ua\/jmag\/pdf\/18\/jm18-0105e.pdf<\/span><\/a><\/li><li><a href=\"https:\/\/jmag.ilt.kharkov.ua\/jmag\/pdf\/18\/jm18-0105e.pdf\"><span style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">S.L. Gefter, A.L. Piven\u2019, <\/span><span style=\"font-weight: 400;\">Linear Partial Differential Equations in Module of Formal Generalized Functions over Commutative Ring<\/span><span style=\"font-weight: 400;\">,<\/span><\/span><\/a><a href=\"https:\/\/www.scopus.com\/sourceid\/130128?origin=resultslist\"> Journal <\/a><span style=\"font-weight: 400;\">of<\/span><a href=\"https:\/\/www.scopus.com\/sourceid\/130128?origin=resultslist\"> Mathematical Sciences (United States)<\/a><span style=\"font-weight: 400;\">, (2021), vol. 257, 579\u2013596.\u00a0<\/span><br \/><a href=\"https:\/\/link.springer.com\/article\/10.1007\/s10958-021-05505-0\"><span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">https:\/\/link.springer.com\/article\/10.1007\/s10958-021-05505-0<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Gefter, S.L., Piven\u2019, A.L. Implicit Linear Differential-Difference Equations in the Module of Formal Generalized Functions over a Commutative Ring. J. Math. Sci. <\/span><b>255, <\/b><span style=\"font-weight: 400;\">409\u2013422 (2021). <\/span><a href=\"https:\/\/link.springer.com\/article\/10.1007\/s10958-021-05381-8\"><span style=\"font-weight: 400;\">https:\/\/link.springer.com\/article\/10.1007\/s10958-021-05381-8<\/span><\/a><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-7004\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"5\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-7004\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> \u041e\u0431\u0440\u0430\u043d\u0456 \u043a\u043e\u043d\u0444\u0435\u0440\u0435\u043d\u0446\u0456\u0457 <\/div><\/span>\n\t\t\t\t\t\t\t<span class='e-n-accordion-item-title-icon'>\n\t\t\t<span class='e-opened' ><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-minus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h384c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t\t<span class='e-closed'><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-plus\" viewbox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M416 208H272V64c0-17.67-14.33-32-32-32h-32c-17.67 0-32 14.33-32 32v144H32c-17.67 0-32 14.33-32 32v32c0 17.67 14.33 32 32 32h144v144c0 17.67 14.33 32 32 32h32c17.67 0 32-14.33 32-32V304h144c17.67 0 32-14.33 32-32v-32c0-17.67-14.33-32-32-32z\"><\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t<div role=\"region\" aria-labelledby=\"e-n-accordion-item-7004\" class=\"elementor-element elementor-element-4a97474 e-flex e-con-boxed e-con e-child\" data-id=\"4a97474\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3eefdc4 elementor-widget elementor-widget-text-editor\" data-id=\"3eefdc4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol><li><span style=\"font-weight: 400;\">Sergiy Gefter and Mariia Stas, A GEOMETRIC APPROACH TO THE MOIVRE-STIRLING FORMULA, <\/span><span style=\"font-weight: 400;\">XVIII International Scientific and Practical Conference \u00abAcademic and University Science: Results and Prospects\u00bb, National University \u00abYurii Kondratyuk Poltava Polytechnic\u00bb, 2025-12-09 \u2013 2025-12-12 <\/span><a href=\"https:\/\/nupp.edu.ua\/uploads\/files\/0\/events\/conf\/2025\/xviii-aunrp\/prog.pdf\"><span style=\"font-weight: 400;\">https:\/\/nupp.edu.ua\/uploads\/files\/0\/events\/conf\/2025\/xviii-aunrp\/prog.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Gefter S., <\/span><span style=\"font-weight: 400;\">Karolinsky E., Skurihin R., Categorical Version of Shilov\u2019s Theorem on Closed Equivalence Relations, \u201cAlgebraic and geometric methods of analysis\u201d, <\/span><span style=\"font-weight: 400;\">May 26-29, 2025, Odesa, Ukraine, p. 103.<\/span> <a href=\"https:\/\/www.imath.kiev.ua\/~topology\/conf\/agma2025\/agma2025-theses.pdf\"><span style=\"font-weight: 400;\">https:\/\/www.imath.kiev.ua\/~topology\/conf\/agma2025\/agma2025-theses.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Gefter S., Piven\u2019 O., Nonlinear partial differential equations in module of copolynomials over a commutative ring, International Conference dedicated to the 145th anniversary of Hans Hahn's birth, September 23-27, 2024, Chernivtsi National University named after Yuriy Fedkovych. \u2013 Chernivtsi: 2024, P. 130\u2013131. <\/span><a href=\"https:\/\/hahn.chnu.edu.ua\/media\/ntbkpax0\/book-of-abstracts.pdf\"><span style=\"font-weight: 400;\">https:\/\/hahn.chnu.edu.ua\/media\/ntbkpax0\/book-of-abstracts.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Sergiy Gefter and Aleksey Piven\u2019, Representations of solutions of some nonlinear PDEs in the form of series in powers of the -function, Bogolyubov Kyiv Conference \u201cProblems of Theoretical and Mathematical Physics\u201d, Kyiv, Ukraine, September 24-26, 2024 Book of abstracts.\u2013P.110 <\/span><a href=\"https:\/\/indico.bitp.kiev.ua\/event\/13\/book-of-abstracts.pdf\"><span style=\"font-weight: 400;\">https:\/\/indico.bitp.kiev.ua\/event\/13\/book-of-abstracts.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Gefter, S., Piven\u2019A., Linear differential operators of infinite order in the module of copolynomials, Proceedings of the international scientific conference \u201cMathematics and Information Technologies\u00bb, dedicated to the 55th anniversary of the Faculty of Mathematics and Informatics, Chernivtsi, Ukraine, September 28\u201330, 2023, Chernivtsi National University.\u2013Chernivtsi: 2023.\u2013 P. 52\u201355.<\/span> <a href=\"https:\/\/fmi.chnu.edu.ua\/media\/qhufs0d5\/materialy-mizhnorodnoi-naukovoi-konferentsii-fmi55.pdf\"><span style=\"font-weight: 400;\">https:\/\/fmi.chnu.edu.ua\/media\/qhufs0d5\/materialy-mizhnorodnoi-naukovoi-konferentsii-fmi55.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Sergey Gefter, Aleksey Piven\u2019, Partial differential equations in the module of copolynomials in several variables over a commutative ring\/\/ 6-th International Conference \u201cDifferential Equations and Control Theory\u2019\u2019 DECT-2023:Book of abstracts. Kharkiv: V.N. Karazin Kharkiv University, 2023.\u2013 P.15\u201316.<\/span> <a href=\"https:\/\/appmath.univer.kharkov.ua\/pdf\/DECT2023\/DECT2023_Book.pdf\"><span style=\"font-weight: 400;\">https:\/\/appmath.univer.kharkov.ua\/pdf\/DECT2023\/DECT2023_Book.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">Anna Goncharuk, Sergey Gefter, Aleksey Piven\u2019, Periodic and quasi-polynomial solutions of implicit linear difference equations over commutative rings, ICDEA 2022, 27th International Conference on Difference Equations and Applications,18-22 July 2022, Paris-Saclay, France, P. 137.\u00a0<\/span> <a href=\"https:\/\/icdea2022.sciencesconf.org\/data\/pages\/icdea2022_leaflet_v5_1_.pdf\"><span style=\"font-weight: 400;\">https:\/\/icdea2022.sciencesconf.org\/data\/pages\/icdea2022_leaflet_v5_1_.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">A.B. Goncharuk; S.L. Gefter; O.L. Piven\u2019, Quasi-polynomial solutions of implicit linear difference equations over a local commutative ring, THE INTERNATIONAL ONLINE CONFERENCE \u201cCURRENT TRENDS IN ABSTRACT AND APPLIED ANALYSIS\u201d, Book of Abstracts, Ivano-Frankivsk, 2022 , P.32\u00a0 <\/span><a href=\"https:\/\/conference.pu.if.ua\/cta\/BookOfAbstracts.pdf\"><span style=\"font-weight: 400;\">https:\/\/conference.pu.if.ua\/cta\/BookOfAbstracts.pdf<\/span><\/a><\/li><li><span style=\"font-weight: 400;\">S. Gefter, A. Piven\u2019, Linear differential equations in the module of copolynomials, V<\/span><span style=\"font-weight: 400;\">th<\/span><span style=\"font-weight: 400;\"> International conference \u201cDifferential equations and control theory\u201d, Book of abstracts, 2021, P. 18 .\u00a0 <\/span><a href=\"https:\/\/appmath.univer.kharkov.ua\/pdf\/DECT2021\/DECT2021_Book.pdf\"><span style=\"font-weight: 400;\">https:\/\/appmath.univer.kharkov.ua\/pdf\/DECT2021\/DECT2021_Book.pdf<\/span><\/a><\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t<details id=\"e-n-accordion-item-7005\" class=\"e-n-accordion-item\" >\n\t\t\t\t<summary class=\"e-n-accordion-item-title\" data-accordion-index=\"6\" tabindex=\"-1\" aria-expanded=\"false\" aria-controls=\"e-n-accordion-item-7005\" >\n\t\t\t\t\t<span class='e-n-accordion-item-title-header'><div class=\"e-n-accordion-item-title-text\"> \u041d\u0430\u0443\u043a\u043e\u0432\u0456 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