Modern Methods, Problems and Applications of Operator Theory and Harmonic Analysis

The international OTHA research network presents following special issues in peer-reviewed journals from Springer and Wiley, (Q1–Q3). The topics cover asymptotic analysis, optimization, machine learning, stochastics, generative models, inverse problems, operator theory, harmonic analysis, and a celebratory issue dedicated to the 85th anniversary of Professor Stefan Samko. Details and webpages for the special issues are below.

Topical Collection “Asymptotics, optimization and machine learning” in “Boletín de la Sociedad Matemática Mexicana” (Birkhauser Verlag Basel) – Q2 journal with SJR 2024 0.41. This special issue is dedicated to the rich interplay between asymptotic analysis, optimization, and modern machine learning.
Deadline: 31 December 2026.
Webpage: https://link.springer.com/collections/iiiibdefbc
Guest editors: Pavel Naumkin (Mexico), Mikhail A. Karapetyants (Austria), Nikolaos Pallikarakis (Greece), and Stefano Serra-Capizzano (Italy).

Special Issue "Stochastic Analysis and Optimization, Generative Modeling, and Reinforcement Learning: Theory and Applications" in “Journal of Mathematical Sciences” (Springer Nature) – Q3 journal with SJR 2024 0.28. This Special Issue aims to bring together researchers working on the theoretical foundations of stochastic analysis, optimization and applications in machine learning.
Deadline: 30 September 2026.
Webpage: https://link.springer.com/collections/abceecbifg
Guest editors: Arutyun Avetisyan (Russia), Evgeny Burnaev (Russia), Angelo Sifaleras (Greece), and Ye Tian (China).

Special issue “Inverse Problems, Numerical Methods and Artificial Intelligence” in “Mathematical Methods in the Applied Sciences” (Wiley) – Q1 journal with SJR 2024 0.63. This Special Issue focuses on the intersection of AI and inverse problems, with particular emphasis on methodological advances and innovative numerical solutions.
Deadline: 30 June 2026.
Webpage: https://onlinelibrary.wiley.com/page/journal/10991476/call-for-papers/si-2025-001556
Guest editors: Vladislav V. Kravchenko (Mexico), Arutyun Avetisyan (Russia), Evgeny Burnaev (Russia), and Alexey Karapetyants (Russia).

Special issue “Operator Theory and Harmonic Analysis in Armenia (OTHA-Spring 2026)” in “Lobachevskii Journal of Mathematics” (Springer Nature) – Q2 journal with SJR 2024 0.435. This is an extended edition in the sense that all participants of the OTHA events (conferences, workshops) are invited as well.
Deadline: 30 June 2026.
Webpage of the journal: https://link.springer.com/journal/12202
Guest editors: Kirill Golubnichiy (USA), Alexey Karapetyants (Russia), Zalina Kusraeva (Russia), and Vladimir Protasov (Italy).

Special issue "OTHA-2026: Advanced and Perspectives on Operator Theory and Harmonic Analysis" in “Journal of Mathematical Sciences” (Springer Nature) – Q3 journal with SJR 2024 0.28. This special issue is prepared as part of the activities of the international scientific group OTHA Network in 2026.
Deadline: 31 December 2026.
Webpage: https://link.springer.com/collections/ahhejejdfh
Guest editors: Armenak Babayan (Armenia), Heikki Orelma (Finland), and Luigi D'Onofrio (Italy).

Special Issue dedicated to the 85 anniversary of Prof. Stefan Samko in “Journal of Mathematical Sciences” (Springer Nature) – Q3 journal with SJR 2024 0.28. We welcome high quality research papers from a wide mathematical spectrum, and especially from those topics in which Stefan Samko has been active, e.g. operator theory, function spaces, approximations, fractional calculus, harmonic analysis, etc.
Deadline: 30 November 2026.
Webpage: https://link.springer.com/collections/jiebbcdbfg
Guest editors: Alexandre Almeida (Portugal), Humberto Rafeiro (UAE), Ilya Spitkovsky (USA), and Salaudin Umarkhadzhiev (Russia).