Head of the Department of Mathematics.

In 2002, he was hired as an assistant in the Theoretical Mathematics Department at M.Kh. Dulaty Taraz State University. In 2004, he entered graduate school in the program «01.01.02 - Differential Equations and Mathematical Physics», graduating in 2006 and being hired as a senior lecturer in the «Mathematics and MTM» Department. From 2010 to 2013, he completed his PhD studies in the specialty «6D010600 – Mathematics» at the L.N. Gumilyov Eurasian National University. In 2013, he defended his PhD dissertation on "Solvability and Properties of the Solution of One Class of Mixed-Type Differential Equations in an Unbounded Domain." In 2014, he was accepted as an Associate Professor in the Department of Mathematics. In 2024-2025, he completed a research internship at George Washington University (Washington DC, USA) as part of the Bolashak Center's "500 Scholars" program.

Education

Bachelor's degree: 1997-2001, M.Kh. Dulaty TarSU

Master's degree: 2001-2002, M.Kh. Dulaty TarSU

Postgraduate studies: 2004-2006, TarSPI

PhD degree: 2010-2013, L.N. Gumilyov Eurasian National University

1. Spectral Problems of Differential Operators of Non-Classical Type. 2013-2015.
2. On Bounded Invertibility and Spectral Properties of Singular Differential Operators of Mixed Type. 2015-2017.
3. AP05131080 "Existence of the Resolvent and Discreteness of the Spectrum of Singular Differential Operators of Hyperbolic Type in the Space." 2018-2020.
4. AP08855802 "Existence, Compactness of the Resolvent, and Estimates for the Eigenvalues ​​and S-Values ​​of Mixed-Type Operators with Strongly Increasing and Rapidly Oscillating Coefficients in Rn." 2020-2022.
5. AP19676466 "Maximal Regularity and Differential Properties of Solutions to Singular Third-Order Partial Differential Equations." 2023-2025.

1. M.B.Muratbekov, K.Ospanov, S. Igisinov. Solvability of a class of mixed type second order equations and nonlocal estimates // Applied Mathematics Letters, (2012) Vol.25, No.11, pp. 1661-1665.
2. M.Muratbekov, S.Igisinov. Estimates of the approximation numbers (s-numbers) for a class of differential operators of mixed type AIP Conference Proceedings 1676, 020068 (2015);
3. M.Muratbekov, S.Igisinov, A.B.Shyrakbaev. On separability of a differential operator of non-classical type in an unbounded domain// AIP conference Proceedings,1759, 020074 (2016);
4. Muratbekov M.B., S. Igissinov. Estimates of Eigenvalues of a Semiperiodic Dirichlet Problem for a Class of Degenerate Elliptic Equations // Symmetry. – 2022. – Vol. 14,692.
5. M.Muratbekov, M.Muratbekov and S.Igissinov. Estimates for the Approximation and Eigenvalues of the Resolvent of a Class of Singular Operators of Parabolic Type. Mathematics 2023, 11, 4584.

1. Muratbekov M.B., Musilimov B.M., Igisinov S.Zh. On the existence and differential properties of solutions to one class of singular differential equations of mixed type// Vestnik of KarSU. - 2010. - №3(59) - P.45-56
2. Muratbekov M.B., Medetbekov M., Igisinov S.Zh. On the existence and uniqueness of solutions to one class of singular equations of mixed type. Vestnik of KarSU. - 2010. - №3(59) - P.56-61
3. Igisinov S.Zh. On closability and bounded invertibility of a differential operator of mixed type in an unbounded domain. Vestnik of KarSU 2013. - №1(69). – P. 28-32
4. M.B. Muratbekov, S.Zh. Igisinov. On closability and bounded invertibility of a differential operator of mixed type in an unbounded domain. Vestnik of Karaganda State University. – – 2015. – №2(78). – P. 106-112.
5. M.B. Muratbekov, A.B. Shyrakbaev, S.Zh. Igisinov. On separability of a differential operator of non-classical type defined in an unbounded domain. Vestnik of Karaganda State University. – 2016. – №2(82) . – P. 95-107.
6. Muratbekov M.B., Igisinov S.Zh, Musilimov B., Makulbekova R.R. On the spectral properties of a class of high-order differential operators with operator coefficients. Bulletin of Karaganda University. – 2020. – №2(98). – P.110-124.
7. Igisinov S.Zh., Zhumaliyeva L.D., Suleimbekova A.O., Bayandiyev Ye.N. Estimates of singular numbers (s-numbers) for a class of degenerate elliptic operators. Bulletin of the Karaganda University. –2022. – №3 (107). – P. 51-58.

S. Igissinov is the author of 1 monograph, 1 textbook, and 25 scientific articles, including 7 articles in scientific journals recommended by the Committee for Quality Assurance in Science and Higher Education (CQASHE), 12 articles in scientific journals included in the Web of Science database, and 8 articles in scientific journals included in the Scopus database. He has also presented papers on his research findings at numerous international and national scientific conferences, and his papers have been included in conference proceedings.