Stefanchuk Mariia Volodymyrivna
Education
2008 – 2012 – Volodymyr Hnatyuk Ternopil National Pedagogical University, Bachelor's degree in Mathematics.
2012 – 2013 – Volodymyr Hnatyuk Ternopil National Pedagogical University, Master's degree in Mathematics.
2013 – 2016 – Postgraduate, Institute of Mathematics of the National Academy of Sciences of Ukraine.
2017 – PhD (Physics and Mathematics).
2012 – 2013 – Volodymyr Hnatyuk Ternopil National Pedagogical University, Master's degree in Mathematics.
2013 – 2016 – Postgraduate, Institute of Mathematics of the National Academy of Sciences of Ukraine.
2017 – PhD (Physics and Mathematics).
Dissertations
Ph.D. thesis "Generalized convex sets and their applications" under the supervision of Doctor of Physical and Mathematical Sciences Y. B. Zelinsky – 2017.
Research interests
Convex analysis.
Complex and hypercomplex analysis.
Generalized convex sets and generalized convex functions in Euclidean spaces.
Quasiconformal mappings and their generalization on the complex plane.
Complex and hypercomplex analysis.
Generalized convex sets and generalized convex functions in Euclidean spaces.
Quasiconformal mappings and their generalization on the complex plane.
Experience
2016 - now - Junior Researcher, Institute of Mathematics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
2025 - now - Researcher, Institute of Mathematics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
2025 - now - Researcher, Institute of Mathematics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine.
Talks on conferences
2025 - On the power growth order of ring Q-homeomorphisms with respect to the p-module. Ukraine Mathematics Conference "At the End of the Year 2025" (December 18-19, 2025, Kyiv).
2025 - On the asymptotic behavior at infinity of solutions of the Beltrami equation with two characteristics. International scientific online conference "Algebraic and geometric methods of analysis" (May 26-29, 2025, Ukraine).
2025 - Extremal problems on the minimization of the area functional. International Conference "Complex and hypercomplex analysis and their applications" (August 6-10, 2025, Zhytomyr).
2025 - On the exponential asymptotics of solutions of the nonlinear Beltrami equation at a point of the complex plane. Workshop SOMPATY - 2025 (May 12-16, 2025, Kyiv).
2025 - Exponential asymptotics of regular homeomorphisms at a point of the complex plane. 15th ISAAC Congress 2025 (July 21-25, 2025, Astana, Kazakhstan).
2025 - On the exponential growth at infinity of lower Q-homeomorphisms. XX International Scientific Mykhailo Kravchuk Conference (November 17-20, 2025, Kyiv).
2025 - On the exponential asymptotics of one class of homeomorphisms at a point of the complex plane. International Conference of Young Mathematicians (June 4-6, 2025, Kyiv).
2025 - On exponential asymptotics of ring Q-homeomorphisms at infinity. Conference of Young Scientists "Pidstryhach Readings – 2025" (May 27-29, 2025, Lviv).
2024 - On the finite Lipschitzness of solutions to the nonlinear Cauchy-Riemann-Beltrami type equation. Hypercomplex Seminar 2024 (September 14-18, 2024, Poland).
2024 - On the asymptotic behavior of the diameter of the image of the ball. Hypercomplex Seminar 2024 (September 14-18, 2024, Poland).
2024 - On the asymptotic behavior of solutions to nonlinear Beltrami equation. International scientific online conference "Algebraic and geometric methods of analysis" (May 27-30, 2024, Ukraine).
2024 - Asymptotic behavior at infinity of solutions of the nonlinear Beltrami equation. I All-Ukrainian Scientific and Practical Conference with International Participation "Modern Problems of Mathematics: Applied Aspect" (May 30, 2024, Ukraine).
2024 - Local Hölder continuity of solutions of the nonlinear Beltrami equation. Conference of Young Scientists "Pidstryhach Readings - 2024" (May 27-29, 2024, Ukraine).
2023 - On the logarithmic asymptotic of solutions of the nonlinear Cauchy-Riemann-Beltrami type equation. 14th ISAAC Congress 2023 (July 17–21, 2023, Ribeirão Preto, Brazil).
2023 - On the exponential asymptotic of solutions of the nonlinear Cauchy-Riemann-Beltrami type equation. Hypercomplex Seminar 2023 (July 9–14, 2023, Poland).
2023 - On the global finite mean oscillation and the Beltrami equation. International Scientific Conference "Current Problems of Mechanics and Mathematics – 2023" (May 23 – 25, 2023, Lviv).
2023 - On the lower estimate of the circle image diameter. International scientific conference "Algebraic and geometric methods of analysis" (May 29 – June 1, 2023, Ukraine).
2023 - On the asymptotic properties of solutions of the nonlinear Beltrami equation. XIX International Scientific Mykhailo Kravchuk Conference, dedicated to the 125th anniversary of Igor Sikorsky Kyiv Polytechnic Institute (October 11-12, 2023, Ukraine).
2023 - On the functional asymptotics of solutions to a nonlinear equation of the Cauchy-Riemann-Beltrami type. International conference of young mathematicians (June 1–3, 2023, Kyiv).
2023 - On the finite Lipshitziness of solutions to the Beltrami nonlinear equation. International scientific conference "Mathematics and Information Technologies" (September 28-30, 2023, Chernivtsi).
2022 - On the global finite mean oscilation and the Beltrami equation. International scientific conference "Applied Mathematics and Information Technologies" (September 22-24, 2022, Chernivtsi).
2022 - Some extreme problems for solutions of the nonlinear Beltrami equation. Conference of young scientists "Pidstryhach Readings – 2022" (May 25-27, 2022, Lviv).
2021 - Local properties of solutions of nonlinear Beltrami equation. (Hyper)Complex Seminar 2021 in memoriam of prof. Julian Ławrynowicz (11-14 November, 2021, Poland).
2021 - On the local behavior of the nonlinear Cauchy-Riemann-Beltrami system. International Conference of Young Mathematicians (June 3-5, 2021, Kyiv).
2021 - Local behavior of regular solutions of the nonlinear Beltrami equation. Conference of young scientists "Prystrygachiv readings - 2021" (May 26-28, 2021, Lviv).
2020 - Some generalizations of the problem about the shadow. Conference of young scientists "Prystrygachiv readings - 2020" (May 26-28, 2020, Lviv).
2020 - On the local properties of solutions of nonlinear Beltrami equations. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis - 2020" (February 26 – March 1, 2020, Vorohta).
2019 - Logarithmic asymptotics for solutions of nonlinear Beltrami equations. International Conference of Young Mathematicians (June 6-8, 2019, Kyiv).
2019 - Linearly convex and conjugate functions in a hypercomplex spase. Final AMMODIT Conference "Mathematics for Life Sciences" (March 18-22, 2019, Kyiv).
2019 - Asymptotic behavior of solutions of nonlinear Beltrami equations. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis - 2019" (February 25 - March 1, 2019, Vorohta).
2018 - Logarithmic asymptotics for solutions of nonlinear Beltrami equations. International scientific conference "Modern problems of mathematics and its application in natural sciences and information technologies", dedicated to the 50th anniversary of the Faculty of Mathematics and Informatics (September 17-19, 2018, Chernivtsi).
2018 - An analog of the Schwarz lemma for regular homeomorphisms. The 13th Summer School Analysis, Topology and Applications (July 19 - August 11, 2018, Vyzhnytsya, Chernivtsi Region).
2018 - Asymptotic behavior of solutions to a nonlinear Beltrami eqution. International scientific Conference "Algebraic and geometric methods of analysis" (May 30 - June 4, 2018, Odesa).
2018 - The shadow problem and its generalization. 4th Ammodit Conference (March 19-23, 2018, Malekhiv, Lviv region).
2018 - Lipschitz analogue of the Ikoma-Schwartz lemma. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 27 - March 2, 2018, Vorohta).
2017 - Linearly convex functions in a hypercomplex space. The International Conference in Functional Analysis dedicated to the 125th anniversary of Stefan Banach (September 18-23, 2017, Lviv).
2017 - m-convex sets and the shadow problem. XII-th Summer School "Algebra, Topology, Analysis" (July 10 - 23, 2017, Kolochava village, Zakarpatian district).
2017 - h-hull and h-extremal elements of the set in a space H^n. International Conference of Young Mathematicians (June 7-10, 2017, Kyiv).
2017 - Properties of conjugate functions in a hypercomplex space. International scientific conference "Algebraic and geometric methods of analysis" (May 31 - June 5, 2017, Odessa).
2017 - The sets of measure zero containing any quantity of sets of definite class. Conference of young scientists "Prystrygachiv readings - 2017" (May 23-25, 2017, Lviv).
2017 - Generalization of the concept of convexity in a hypercomplex space. XV International Scientific - Practical Conference of Students, Postgraduates and Young Scientists "Shevchenkivska Vesna - 2017" (April 4-6, 2017, Kyiv).
2017 - Generalized convex sets and functions. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 22-25, 2017, Vorohta).
2016 - Properties of linearly convex and conjugate functions in a hypercomplex space. XIth Summer School "Algebra, Topology, Analysis" (August 1-14, 2016, Odessa).
2016 - Generalization of the shadow problem for the family of sets. International Conference "Geometry and topology in Odessa - 2016" (June 2-8, 2016, Odessa).
2016 - Hypercomplex hulls and extreme elements in hypercomplex space. International Conference "Complex analysis and related topics" (May 30 - June 4, 2016, Lviv).
2016 - Some generalizations of the shadow problem. XIV International Scientific - Practical Conference of Students, Postgraduates and Young Scientists "Shevchenkivska Vesna - 2016" (April 6-8, 2016, Kyiv).
2016 - Extremal elements and H-quasiconvex sets in a space H^n. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 24-27, 2016, Vorohta).
2015 - Generalized convex sets and shadow's problem. Xth Summer School "Algebra, Topology, Analysis" (August 3-15, 2015, Odessa).
2015 - The set of measure zero that contains spheres of all radiuses. Scientific Conference dedicated to the 100th anniversary of K.M. Fishman (July 1-4, 2015, Chernivtsi).
2015 - Shadow's problem for the spheres. International Conference of Young Mathematicians (June 3-6, 2015, Kyiv).
2015 - Linearly convex and conjugate functions in a hypercomplex space. XIII International Scientific - Practical Conference of Students, Postgraduates and Young Scientists "Shevchenkivska Vesna - 2015" (April 1-3, 2015, Kyiv).
2015 - Shadow's problem and related questions. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 25 - March 1, 2015, Vorohta).
2025 - On the asymptotic behavior at infinity of solutions of the Beltrami equation with two characteristics. International scientific online conference "Algebraic and geometric methods of analysis" (May 26-29, 2025, Ukraine).
2025 - Extremal problems on the minimization of the area functional. International Conference "Complex and hypercomplex analysis and their applications" (August 6-10, 2025, Zhytomyr).
2025 - On the exponential asymptotics of solutions of the nonlinear Beltrami equation at a point of the complex plane. Workshop SOMPATY - 2025 (May 12-16, 2025, Kyiv).
2025 - Exponential asymptotics of regular homeomorphisms at a point of the complex plane. 15th ISAAC Congress 2025 (July 21-25, 2025, Astana, Kazakhstan).
2025 - On the exponential growth at infinity of lower Q-homeomorphisms. XX International Scientific Mykhailo Kravchuk Conference (November 17-20, 2025, Kyiv).
2025 - On the exponential asymptotics of one class of homeomorphisms at a point of the complex plane. International Conference of Young Mathematicians (June 4-6, 2025, Kyiv).
2025 - On exponential asymptotics of ring Q-homeomorphisms at infinity. Conference of Young Scientists "Pidstryhach Readings – 2025" (May 27-29, 2025, Lviv).
2024 - On the finite Lipschitzness of solutions to the nonlinear Cauchy-Riemann-Beltrami type equation. Hypercomplex Seminar 2024 (September 14-18, 2024, Poland).
2024 - On the asymptotic behavior of the diameter of the image of the ball. Hypercomplex Seminar 2024 (September 14-18, 2024, Poland).
2024 - On the asymptotic behavior of solutions to nonlinear Beltrami equation. International scientific online conference "Algebraic and geometric methods of analysis" (May 27-30, 2024, Ukraine).
2024 - Asymptotic behavior at infinity of solutions of the nonlinear Beltrami equation. I All-Ukrainian Scientific and Practical Conference with International Participation "Modern Problems of Mathematics: Applied Aspect" (May 30, 2024, Ukraine).
2024 - Local Hölder continuity of solutions of the nonlinear Beltrami equation. Conference of Young Scientists "Pidstryhach Readings - 2024" (May 27-29, 2024, Ukraine).
2023 - On the logarithmic asymptotic of solutions of the nonlinear Cauchy-Riemann-Beltrami type equation. 14th ISAAC Congress 2023 (July 17–21, 2023, Ribeirão Preto, Brazil).
2023 - On the exponential asymptotic of solutions of the nonlinear Cauchy-Riemann-Beltrami type equation. Hypercomplex Seminar 2023 (July 9–14, 2023, Poland).
2023 - On the global finite mean oscillation and the Beltrami equation. International Scientific Conference "Current Problems of Mechanics and Mathematics – 2023" (May 23 – 25, 2023, Lviv).
2023 - On the lower estimate of the circle image diameter. International scientific conference "Algebraic and geometric methods of analysis" (May 29 – June 1, 2023, Ukraine).
2023 - On the asymptotic properties of solutions of the nonlinear Beltrami equation. XIX International Scientific Mykhailo Kravchuk Conference, dedicated to the 125th anniversary of Igor Sikorsky Kyiv Polytechnic Institute (October 11-12, 2023, Ukraine).
2023 - On the functional asymptotics of solutions to a nonlinear equation of the Cauchy-Riemann-Beltrami type. International conference of young mathematicians (June 1–3, 2023, Kyiv).
2023 - On the finite Lipshitziness of solutions to the Beltrami nonlinear equation. International scientific conference "Mathematics and Information Technologies" (September 28-30, 2023, Chernivtsi).
2022 - On the global finite mean oscilation and the Beltrami equation. International scientific conference "Applied Mathematics and Information Technologies" (September 22-24, 2022, Chernivtsi).
2022 - Some extreme problems for solutions of the nonlinear Beltrami equation. Conference of young scientists "Pidstryhach Readings – 2022" (May 25-27, 2022, Lviv).
2021 - Local properties of solutions of nonlinear Beltrami equation. (Hyper)Complex Seminar 2021 in memoriam of prof. Julian Ławrynowicz (11-14 November, 2021, Poland).
2021 - On the local behavior of the nonlinear Cauchy-Riemann-Beltrami system. International Conference of Young Mathematicians (June 3-5, 2021, Kyiv).
2021 - Local behavior of regular solutions of the nonlinear Beltrami equation. Conference of young scientists "Prystrygachiv readings - 2021" (May 26-28, 2021, Lviv).
2020 - Some generalizations of the problem about the shadow. Conference of young scientists "Prystrygachiv readings - 2020" (May 26-28, 2020, Lviv).
2020 - On the local properties of solutions of nonlinear Beltrami equations. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis - 2020" (February 26 – March 1, 2020, Vorohta).
2019 - Logarithmic asymptotics for solutions of nonlinear Beltrami equations. International Conference of Young Mathematicians (June 6-8, 2019, Kyiv).
2019 - Linearly convex and conjugate functions in a hypercomplex spase. Final AMMODIT Conference "Mathematics for Life Sciences" (March 18-22, 2019, Kyiv).
2019 - Asymptotic behavior of solutions of nonlinear Beltrami equations. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis - 2019" (February 25 - March 1, 2019, Vorohta).
2018 - Logarithmic asymptotics for solutions of nonlinear Beltrami equations. International scientific conference "Modern problems of mathematics and its application in natural sciences and information technologies", dedicated to the 50th anniversary of the Faculty of Mathematics and Informatics (September 17-19, 2018, Chernivtsi).
2018 - An analog of the Schwarz lemma for regular homeomorphisms. The 13th Summer School Analysis, Topology and Applications (July 19 - August 11, 2018, Vyzhnytsya, Chernivtsi Region).
2018 - Asymptotic behavior of solutions to a nonlinear Beltrami eqution. International scientific Conference "Algebraic and geometric methods of analysis" (May 30 - June 4, 2018, Odesa).
2018 - The shadow problem and its generalization. 4th Ammodit Conference (March 19-23, 2018, Malekhiv, Lviv region).
2018 - Lipschitz analogue of the Ikoma-Schwartz lemma. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 27 - March 2, 2018, Vorohta).
2017 - Linearly convex functions in a hypercomplex space. The International Conference in Functional Analysis dedicated to the 125th anniversary of Stefan Banach (September 18-23, 2017, Lviv).
2017 - m-convex sets and the shadow problem. XII-th Summer School "Algebra, Topology, Analysis" (July 10 - 23, 2017, Kolochava village, Zakarpatian district).
2017 - h-hull and h-extremal elements of the set in a space H^n. International Conference of Young Mathematicians (June 7-10, 2017, Kyiv).
2017 - Properties of conjugate functions in a hypercomplex space. International scientific conference "Algebraic and geometric methods of analysis" (May 31 - June 5, 2017, Odessa).
2017 - The sets of measure zero containing any quantity of sets of definite class. Conference of young scientists "Prystrygachiv readings - 2017" (May 23-25, 2017, Lviv).
2017 - Generalization of the concept of convexity in a hypercomplex space. XV International Scientific - Practical Conference of Students, Postgraduates and Young Scientists "Shevchenkivska Vesna - 2017" (April 4-6, 2017, Kyiv).
2017 - Generalized convex sets and functions. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 22-25, 2017, Vorohta).
2016 - Properties of linearly convex and conjugate functions in a hypercomplex space. XIth Summer School "Algebra, Topology, Analysis" (August 1-14, 2016, Odessa).
2016 - Generalization of the shadow problem for the family of sets. International Conference "Geometry and topology in Odessa - 2016" (June 2-8, 2016, Odessa).
2016 - Hypercomplex hulls and extreme elements in hypercomplex space. International Conference "Complex analysis and related topics" (May 30 - June 4, 2016, Lviv).
2016 - Some generalizations of the shadow problem. XIV International Scientific - Practical Conference of Students, Postgraduates and Young Scientists "Shevchenkivska Vesna - 2016" (April 6-8, 2016, Kyiv).
2016 - Extremal elements and H-quasiconvex sets in a space H^n. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 24-27, 2016, Vorohta).
2015 - Generalized convex sets and shadow's problem. Xth Summer School "Algebra, Topology, Analysis" (August 3-15, 2015, Odessa).
2015 - The set of measure zero that contains spheres of all radiuses. Scientific Conference dedicated to the 100th anniversary of K.M. Fishman (July 1-4, 2015, Chernivtsi).
2015 - Shadow's problem for the spheres. International Conference of Young Mathematicians (June 3-6, 2015, Kyiv).
2015 - Linearly convex and conjugate functions in a hypercomplex space. XIII International Scientific - Practical Conference of Students, Postgraduates and Young Scientists "Shevchenkivska Vesna - 2015" (April 1-3, 2015, Kyiv).
2015 - Shadow's problem and related questions. All-Ukrainian scientific conference "Modern problems in Probability Theory and Mathematical Analysis" (February 25 - March 1, 2015, Vorohta).
Miscellaneous
2018 - Grant of the President of Ukraine to support scientific research of young scientists.
2021 - Ya. S. Pidstryhach Award for young scientists, 2021.
2022 – 2023 - Simons Foundation (1030291), November 2022 - October 2023.
2022 – 2024 - Scholarship of the President of Ukraine for young scientists.
2024 – 2025 - Simons Foundation (1290607), February 2024 - January 2025.
2024 - Scholarship of the National Academy of Sciences of Ukraine for young scientists, from November 1, 2024.
2025 - Grant of the National Academy of Sciences of Ukraine to research laboratories/groups of young scientists of the National Academy of Sciences of Ukraine to conduct research in priority areas of science and technology development in 2025-2026.
2025 - 2026 - Simons Foundation (SFI-PD-Ukraine-00014586), April 2025 - March 2026.
2021 - Ya. S. Pidstryhach Award for young scientists, 2021.
2022 – 2023 - Simons Foundation (1030291), November 2022 - October 2023.
2022 – 2024 - Scholarship of the President of Ukraine for young scientists.
2024 – 2025 - Simons Foundation (1290607), February 2024 - January 2025.
2024 - Scholarship of the National Academy of Sciences of Ukraine for young scientists, from November 1, 2024.
2025 - Grant of the National Academy of Sciences of Ukraine to research laboratories/groups of young scientists of the National Academy of Sciences of Ukraine to conduct research in priority areas of science and technology development in 2025-2026.
2025 - 2026 - Simons Foundation (SFI-PD-Ukraine-00014586), April 2025 - March 2026.