#### EDITOR-IN-CHIEF

A.M. Elizarov, Prof., Lobachevskii Institute of Mathematics and Mechanics, Kazan Federal University, Kazan, Russia

#### EDITORS

A.I. Aptekarev, Prof., Moscow State University, Keldysh Institute of Applied Mathematics of the Russian Academy of Sciences (RAS), Moscow, Russia

V.A. Vassiliev, Acad. of the RAS, Prof., Steklov Mathematical Institute of the RAS, Moscow, Russia

#### EXECUTIVE SECRETARY

E.K. Lipachev, Ass. Prof., Lobachevskii Institute of Mathematics and Mechanics, Kazan Federal University, Kazan, Russia

#### EDITORIAL BOARD

F.M. Ablaev, Prof., Kazan Federal University, Kazan, Russia

A.L. Afendikov, Prof., Keldysh Institute of Applied Mathematics of the RAS, Moscow, Russia

M.M. Arslanov, Prof., Lobachevskii Institute of Mathematics and Mechanics, Kazan Federal University, Kazan, Russia

F.G. Avkhadiev, Prof., Lobachevskii Institute of Mathematics and Mechanics, Kazan Federal University, Kazan, Russia

E.M. Chirka, Corresponding Member of the RAS, Prof., Steklov Mathematical Institute of the RAS, Moscow, Russia

Prof., School of Mathematics, University of Leeds, U.K.

N.P. Dolbilin, Prof., Steklov Mathematical Institute of the RAS, Moscow, Russia

N. Euler, Lulea University of Technology, Lulea, Sweden

S.A. Grigoryan, Foreign Member of Armenian Academy of Sciences, Prof., Kazan State Power-Engineering University, Kazan, Russia

A.S. Holevo, Prof., Steklov Mathematical Institute of the RAS, Moscow, Russia

N.H. Ibragimov, Prof., Blekinge Institute of Technology, Karlskrona, Sweden

I.S. Krasil'shchik, Prof., Independent University of Moscow and Russian State University for the Humanities, Moscow, Russia

A.V. Lapin, Prof., Kazan Federal University, Kazan, Russia

Steffen Lempp, Prof., Department of Mathematics, University of Wisconsin, USA

G.A. Leonov, Corresponding Member of the RAS, Prof., Mathematics and Mechanics Faculty, St. Petersburg State University, St. Petersburg, Russia

V.V. Lychagin, Prof., Institute of Mathematics and Statistics, University of Tromso, Tromso, Norway

M.A. Malakhaltsev, Prof., University de Los Andes, Bogot?, Colombia

S.P. Novikov, Acad. of the RAS, Head, Department of Geometry and Topology, Steklov Mathematical Institute of the RAS, Moscow, Russia, and also Prof. of University of Maryland, College Park, USA

S.Yu. Pilyugin, Prof., Mathematics and Mechanics Faculty, St. Petersburg State University, St. Petersburg, Russia

A.A. Razborov, Corresponding Member of the RAS, Prof., Steklov Mathematical Institute of the RAS, Moscow, Russia; Prof. of University of Chicago, USA

L.N. Schur, Prof., Scientific Center RAS in Chernogolovka, Chernogolovka, Moscow region, Russia

O.E. Tikhonov, Ass. Prof., Kazan Federal University, Kazan, Russia

S.N. Tronin, Prof., Lobachevskii Institute of Mathematics and Mechanics, Kazan Federal University, Kazan, Russia

E.E. Tyrtyshnikov, Corresponding Member of the RAS, Prof., Institute of Numerical Mathematics of the RAS, Moscow, Russia

N.A. Vavilov, Prof., Mathematics and Mechanics Faculty, St. Petersburg State University, St. Petersburg, Russia

O.L. Vinogradov, Prof., Mathematics and Mechanics Faculty, St. Petersburg State University, St. Petersburg, Russia

V.V. Voevodin, Corresponding Member of the RAS, Prof., Head of Department of Supercomputers and Quantum Informatics, Faculty of Computational Mathematics and Cybernetics, M.V. Lomonosov Moscow State University (MSU), Deputy Director of the Scientific Research Computing Center of MSU, Moscow, Russia

A.I. Volodin, Prof., University of Regina, Canada

K.-J. Wirths, Prof., Institute fur Analysis und Algebra, TU Braunschweig, Germany

Yi Zhang, Prof., Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing, P.R. China

V.V. Zharinov, Prof., Steklov Mathematical Institute of the RAS, Moscow, Russia