\documentclass[11pt]{article}
\usepackage[a4paper,left=25mm,right=25mm,bottom=25mm,top=25mm]{geometry}
\usepackage[T2A]{fontenc}
\usepackage[cp1251]{inputenc}
%\usepackage[russian]{babel}
\usepackage[english]{babel}
\usepackage{amsthm}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{indentfirst}
\usepackage{multirow}
\usepackage{graphicx}
\usepackage{wrapfig}
\usepackage{titlesec}
\titleformat{\section}[block]{\large\bfseries\filcenter}{\large\bfseries\thesection.\,}{0pt}{}
\titleformat{\subsection}[runin]{\normalfont\bfseries}{\indent\normalfont\bfseries\thesubsection.\,}{0pt}{}[.]
\newtheoremstyle{theorem}%  % name
{0pt}%                      % space above
{0pt}%                      % space below
{\it}%                      % body font
{\parindent}%               % indent amount
{\bf}%                      % theorem head font
{\normalfont{\bf .}}%           % punctuation after theorem head
{ }%                        % space after theorem head
{}%                         % theorem head spec
\theoremstyle{theorem}
\newtheorem{theorem}{Теорема}[section]
\newtheorem{corollary}[theorem]{Corollary}
\newtheorem{offer}[theorem]{Proposition}
\newtheorem{lemma}[theorem]{Lemma}

\newtheoremstyle{definition}%  % name
{0pt}%                      % space above
{0pt}%                      % space below
{}%                         % body font
{\parindent}%               % indent amount
{\bf}%                      % theorem head font
{\normalfont{\bf .}}%           % punctuation after theorem head
{ }%                        % space after theorem head
{}%                         % theorem head spec
\theoremstyle{definition}
\theoremstyle{definition}
\newtheorem{remark}[theorem]{Remark}
\newtheorem{example}[theorem]{Example}
\newtheorem{pro}[theorem]{Task}
\newtheorem{question}[theorem]{Question}
\newtheorem{definition}[theorem]{Definition}

\makeatletter
\renewcommand\@biblabel[1]{#1.}
\makeatother
\begin{document}
%Не допускается использование в \TeX-файлах «нестандартных»
%\TeX-команд (т.~е. команд, не входящих в стандартную поставку \LaTeX), а
%также переопределение стандартных команд.
%It is not allowed to use ‘non-standard’ commands in \TeX-files \commands (i.e. commands that are not included in the standard LaTeX delivery), as well as overriding of standard commands.

%% UDC - required !!!
UDK 517.5

%% Indicate the section to which the article refers:
   % Real, complex and functional analysis
   % Computational mathematics
   % Discrete mathematics and mathematical cybernetics
   % Differential equations, dynamical systems and optimal control
   % Algebra and number theory
   % Mathematical modeling and numerical methods
   % Mathematical methods of information security
   % Brief communications



\parindent=10mm
\begin{center}
\large\bfseries SECTION TITLE 
\end{center}



\parindent=10mm
\begin{center}
\large\bfseries ARTICLE TITLE 
\end{center}

\medskip

\begin{center}
\large\bfseries I.~I.~Ivanov$^1$, S.~S.~Sidorov$^2$\label{ivanstart}
\end{center}

\medskip

\begin{center}
$^1$ \it Institute of Mathematics of the National academy of Belarus, Minsk, Belarus \\
$^2$ \it Belorussian State University, Minsk, Belarus \\
e-mail: xxx@gmail.com, sss@bsu.by
\end{center}

Abstract in English

{\bf Keywords:} 5-10 keywords/keyword combinations

%%

\parindent=10mm
\begin{center}
\large\bfseries TITLE OF ARTICLE in Russian
\end{center}

\medskip

\begin{center}
\large\bfseries I.~I.~Ivanov$^1$, S.~S.~Sidorov$^2$ in Russian %\label{ivanstart}
\end{center}

\medskip

\begin{center}
in Russian\\
$^1$ \it Institute of Mathematics of the National academy of Belarus, Minsk, Belarus \\
$^2$ \it Belorussian State University, Minsk, Belarus \\
e-mail: xxx@gmail.com, sss@bsu.by
\end{center}


Abstract in Russian

{\bf Ключевые слова:} 5-10 keywords/keyword combinations in Russian


% it is allowed to make without \section and \subsection

\section{Introduction}


%is allowed to be set via \textbf{Theorem 1.1.} \emph{Theorem formulation.}

\begin{theorem} %% \label(FIO_th1)
Text
\end{theorem}

\begin{lemma}
Text
\end{lemma}

%Figures are allowed in png or eps format. It is allowed to arrange side-by-side drawings via minipage, tabular and other methods.

\begin{center}
\includegraphics[width=0.35\textheight]{FIO_Pic_1.png}\\
\small
Fig. 1. Dependence of the thermal conductivity coefficient of the BrO12-Fe composite on temperature
\end{center}	


%It is allowed to use the features of multirow, longtable packages in tables
{\small
\begin{center}
{Table 1. \textbf{Speed of convergence along the spatial direction}}\\
\vspace{2mm}
	\begin{tabular}{ |c|c|c|c|c| }
		\hline
		$h=\pi/30$ & $\tau=0,1 $ & $\|z^h\|_C $ & $ P^h_C $ \\ \hline
		$h$ & $\tau$ & $2,07703e^{-3}$ &-- \\ \hline
		$h/2$ & $\tau/4$ & $1,22758e^{-4}$&4,08063 \\ \hline
		$h/4$ & $\tau/16$ & $7,57039e^{-6}$&4,01931 \\ \hline
		$h/8$ & $\tau/64$ & $4,71584e^{-7}$&4,00478 \\ \hline
	\end{tabular}
\end{center}

%% It is mandatory to post information about funding (grant support for projects, etc.) if available

This work was supported by the Institute of Mathematics of the National Academy of Sciences of Belarus within the framework of the state programme "Convergence--2020".



%\renewcommand{\refname}{\normalsize\bf References}
\begin{thebibliography}{00}
\leftskip=-7mm
\parskip=-0mm
\parsep=0mm
\itemsep=0mm
\labelwidth=-12mm

% articles

\bibitem{eng_FIO_Br67} Braden B. Restricted representations of classical Lie algebras of type $A_2$ and $B_2$. {\it Bull. Amer. Soc.}, 1967, vol.~73, pp.~482--486.

\bibitem{eng_FIO_label2} Monakhov V.~S., Trofimuk A.~A. On supersolubility of a group with seminormal subgroups. {\it Siberian Mathematical Journal, } 2020, vol.~61, iss.~1, pp.~118--126. DOI: https://doi.org/10.1134/S0037446618050166

\bibitem{eng_FIO_14ZG} Bondarenko V.~F., Erofeenko V.~T. The shielding of impulse electromagnetic fields by multilayer plane-parallel screens with alternating magnetic and non-magnetic layers. {\it Physical Bases of Instrumentation}, 2017, vol.~6, no.~2, pp.~53--66 (in Russian).

% books, monographs

\bibitem{eng_FIO_1ZG} Shapiro D.~N. {\it Electromagnetic shielding}. Dolgoprudnyi, Dom Intellekt Publ., 2010 (in Russian).

\bibitem{eng_FIO_sk1} Skiba A.~N. {\it Algebra of formations}. Minsk, Belaruskaya Navuka, 1997, 240~p. (in Russian).

\bibitem{eng_FIO_Seitz87} Seitz G.~M.{\it The maximal subgroups of classical algebraic groups.} Memoirs Amer. Math. Soc., 1987, vol.~67, no.~365.


% abstracts, conference proceedings

\bibitem{eng_FIO_3ZG} Zhukov A.~S., Vasilyeva O.~V. Modular magnetic screens and shielding structures based on them for protection against constant and alternating magnetic fields. {\it Collection of Reports of the XII International Scientific and Technical Conference: New materials and technologies: powder metallurgy, composite materials, protective coatings, welding (May 25--27, 2016, Minsk).} Minsk, 2016, pp.~199--201 (in Russian).

% electronic resource

\bibitem{eng_FIO_lit18} {\it ``The GAP Group: GAP -- Groups, Algorithms, and Programming''}, Ver. 4.11.1 released on 02-03-2021 [Electronic resourse]. -- Mode of access: http://www.gap-system.org.

% patents

\bibitem{eng_FIO_10ZG}	Grabchikov S.~S., Sosnovskaya L.~B., Sharapa T.~E. {\it Multilayer electromagnetic screen}: patent of the Republic of Belarus, no.~11843 of 28.01.2009.

\end{thebibliography}



\end{document} 