The theme of the conferences is related to the different areas of mathematics, especially harmonic analysis, functional analysis, operator theory, function theory, differential equations and fractional analysis, developed intensively last decade. The relevance of this topic is related to the study of complex multiparameter objects that require, in particular, to attract operators with variable parameters and functional spaces with fractional and even variable exponents.

	OTHA-2025 24 - 29 August, 2025 Rostov-on-Don, Russia
	OTHA-2024 25 - 30 AUGUST, 2024 Rostov-on-Don, Russia
	OTHA-2023 20 - 25 AUGUST, 2023 Rostov-on-Don, Russia
	OTHA-2022 21 - 26 August, 2022 Rostov-on-Don, Russia The conference is dedicated to the 80 anniversary of Professor Nikolai K. Karapetiants (1942-2005)
	OTHA-2021 22 - 27 AUGUST, 2021 Rostov-on-Don, Russia The conference is dedicated to the 80 annual jubilee of professor Stefan G. Samko (Russia, Portugal).
	OTHA-2020 23 - 28 August, 2020 Rostov-on-Don, Russia
	OTHA-2019 21 - 26 April, 2019 Rostov-on-Don, Russia
	OTHA-2018 22 - 27 April, 2018 Rostov-on-Don, Russia
	OTHA-2017 24 - 27 of April 2017 Rostov-on-Don, Russia The conference is dedicated to the 75 anniversary of Professor Nikolai K. Karapetiants (1942-2005).
	OTHA-2016 24 - 29 April, 2016 Rostov-on-Don, Russia The conference is dedicated to the 75 annual jubilee of professor Stefan G. Samko (Russia, Portugal).
	OTHA-2015 26 April - 1 May, 2015 Rostov-on-Don, Russia
	OTHA-2014 27 April - 1 May, 2014 Rostov-on-Don, Russia
	OTHA-2013 2-6 June, 2013 Rostov-on-Don, Russia
	OTHA-2012 22 - 26 April, 2012 Rostov-on-Don, Russia
	OTHA-2011 24 - 28 April, 2011 Rostov-on-Don, Russia The conference is dedicated to the 70 annual jubilee of professor Stefan G. Samko (Russia, Portugal)