Workshop OTHA Spring 2025 conference was held from April 27 to May 2, 2025 in cooperation with the Institute of Mathematics of the National Academy of Sciences of Armenia. Organizers and co-chairs of the organizing committee: A.N.Karapetyants (Professor of the Institute of Mathematics, Mechanics and Computer Science and Director of the SFedU Scientific Research Center) and R.G. Aramyan (Director of the Institute of Mathematics of the National Academy of Sciences of the Republic of Armenia).

The conference was attended by scientists and specialists in the field of operator analysis and theory from about 15 countries, including: Vladimir Nazaikinsky (Russia), Sergey Dobrokhotov (Russia), Pavel Gevorgyan (Russia), Alexey Karapetyants (Russia), Rafik Aramyan (Armenia), Helmut Malonek (Portugal), Zhirayr Avetisyan (Belgium), Pavel Exner (Czech Republic), Vladislav Kravchenko (Mexico), Milos Arsenovich (Serbia), Ilya Lifland (Israel), Anton Baranov (Russia), Armen Djerbashyan (Armenia), Mikhail Karapetyants (Russia/Austria), Arran Fernandez (Cyprus/Oman), David Natroshvili (Georgia), Maria Skopina (Russia), Zalina Kusraeva (Russia), Jim Burns (USA), Henrik Shahgolyan (Sweden), Abdel Rahman Youssef (UAE), Tatiana Golea (Germany), Estefania Lozano (Colombia/Mexico), Alexander Mkrtchyan (Armenia/Russia), Armen Vagharshakyan (Armenia) and many other mathematicians of Armenia.

As a result of the workshop, a special issue is being prepared in the journals Journal of Mathematical Sciences (Springer Nature) and Lobachevskii Journal of Mathematics (Kazan).

The OTHA Spring and OTHA Fall workshops are held in the spring and winter of each year and are part of the OTHA conference series: https://otha.sfedu.ru / , http://msrn.sfedu.ru /. This year's OTHA series events celebrate the 15th anniversary of the first OTHA conference in 2011.