Konstantin Dyakonov

Konstantin Dyakonov

Universitat de Barcelona

Experimental Sciences & Mathematics

Born on 30 May 1964 in Leningrad, USSR (=St. Petersburg, Russia). Graduated from Leningrad State University in 1986. PhD in Mathematics from St. Petersburg State University, 1991. Previous long-term positions: - Institute of Analysing Devices, Leningrad, USSR (1986-1989), researcher; - St. Petersburg University of Electrical Engineering, St. Petersburg, Russia, assistant professor (1989-1992) and then associate professor (1992-1998) in the Department of Mathematics; - Universidad de La Laguna, Tenerife, Spain (1996-1997), visiting professor; - Universitat de Barcelona, Spain (1999-2001), visiting research fellow; - Steklov Institute of Mathematics, St. Petersburg Branch (POMI), St. Petersburg, Russia (1998-2007), senior researcher; - Universitat de Barcelona, Spain (2003-2006), Ramón y Cajal researcher. Prizes: Young Scientist Award in the area of Mathematics from Academia Europaea (for fSU researchers), 1998.

Research interests

Most of my research is devoted to spaces of analytic functions of a complex variable. Typically, the functions live on the unit disk and are well-behaved, in a sense, near/on its boundary, the unit circle. Various specific interpretations of "well-behaved", such as a natural growth restriction or some kind of boundary smoothness, give rise to important function spaces with nice properties, and I have studied some of these. I am also concerned with certain types of linear operators (e.g., the so-called Toeplitz and Hankel operators) acting on such spaces.

Selected publications

- Dyakonov KM 2023, 'Questions about extreme points', Integral Equations and Operator Theory, vol. 95, no. 2, Article 14, 11 pp.

- Dyakonov KM 2023, 'Functions with small and large spectra as (non)extreme points in subspaces of H∞', St. Petersburg Mathematical​ Journal, vol. 34, no. 3, pp. 453–462.

- Dyakonov KM 2023, 'Inner functions as strongly extreme points: stability properties', Annales Fennici Mathematici, vol. 48, no. 2, pp. 681–690.

Selected research activities

* Editorial boards: Journal of Function Spaces, Proceedings of the Institute of Applied Mathematics and Mechanics (NAS of Ukraine)
* Courses taught: Integral calculus in several variables (problem solving), Universitat de Barcelona
* Supervision of a TFG, Universitat de Barcelona
* A number of talks at various conferences and seminars in France, Morocco and Germany
* Served as referee for a number of mathematical journals, such as Annals of Functional Analysis, Analysis and Mathematical Physics, Annales Fennici Mathematici, etc.