\documentclass[12pt,twoside,a4paper]{article}
\usepackage{amssymb}
\usepackage{amsfonts,amsmath,amscd,amsthm}
\usepackage{latexsym}
\usepackage{euscript}
\usepackage[pdftex,unicode=true]{hyperref}
\usepackage[english]{babel}
\usepackage{graphicx}
\voffset=-8mm \tolerance=9999 \textwidth=160mm \textheight=235mm
\oddsidemargin=1mm \evensidemargin=-0.2mm
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\pagestyle{myheadings}
\makeatletter %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\renewcommand{\@oddhead}{%
\raisebox{0pt}[\headheight][0pt]{\vbox{\hbox to \textwidth{\strut%
\hfill\parbox[c]{0.8\textwidth}{\centering\large%\sffamily
October 27-29, 2025, Kharkiv, Ukraine}\hfill%
\sffamily\arabic{page}}\hrule}}%
}
\renewcommand{\@evenhead}{%
\raisebox{0pt}[\headheight][0pt]{\vbox{\hbox to \textwidth{\strut%
\sffamily\arabic{page}\large\hfill\parbox[c]{0.8\textwidth}{\centering\large\sffamily
DIFFERENTIAL EQUATIONS and CONTROL THEORY}\hfill%
}\hrule}}%
}%
%%%%%%%%%%%%%%%
\renewcommand{\section}{\@startsection{section}{1}{0pt}%
{3.5ex}{1.3ex}%
{\centering\Large\bfseries}}
%%%%%%%%%%
\newcommand{\ahead}[3]{\refstepcounter{section}\section*{#1\\[0.5ex] \protect\mdseries\large #2, \protect\slshape #3}}%
%%%%%%%%%%%
\newcommand{\aheadtwo}[5]{\refstepcounter{section}\section*{#1\\[0.5ex] \protect\mdseries\large #2, {\protect\slshape\large #3}\\ \protect\mdseries\large #4, \protect\slshape\large #5}}%
%%%%%%%%%%%%%%
\newcommand{\aheadthree}[7]{\refstepcounter{section}\section*{#1\\[0.5ex] \protect\mdseries\large #2, {\protect\slshape\large #3}\\ \protect\mdseries\large #4, {\protect\slshape\large #5}\\ \protect\mdseries\large #6, \protect\slshape\large #7}}%
\makeatother
\renewcommand{\itshape}{\slshape}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newtheorem{proposition}{Proposition}
\newtheorem{lemma}{Lemma}
\newtheorem{theorem}{Theorem}
\newtheorem{corollary}{Corollary}
\newtheorem{definition}{Definition}
\newtheorem{remark}{Remark}
\newtheorem{problem}{Problem}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\renewcommand{\refname}{}
\large %%%%%%%%%%%%%% Please, do not remove this line !!! %%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%% Title and Authors %%%%%%%%%%%%%
\ahead{Sample}% Title of the abstract
{Peter Smith}% Author1
{Kharkiv, Ukraine}% City, Country of author1

% Please, use following templates for one, two, or three authors.

%%%%%% ONE ATHHOR %%%%%%%%%%%%%%%%%%%%%%%%%%%
%\ahead{Title of the abstract}%
%{Name of Author}%
%{City, Country}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%% TWO AUTHORS %%%%%%%%%%%%%%%%%%%%%%%%%%%
%\aheadtwo{Title of the abstract}%
%{Name of Author1}%
%{City, Country of Author1}%
%{Name of Author2}%
%{City, Country of Author2}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%% THREE AUTHORS %%%%%%%%%%%%%%%%%%%%%%%%%%
%\aheadtwo{Title of the abstract}%
%{Name of Author1}%
%{City, Country of Author1}%
%{Name of Author2}%
%{City, Country of Author2}%
%{Name of Author3}%
%{City, Country of Author3}%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%  Abstract %%%%%%%%%%%%%%%%%%%%%%%
%% START THE TEXT OF YOUR ABSTRACT HERE

Please, use this template  to prepare your abstract. 

\textbf{Please, do not use your own macros and do not change the text before} \verb@\begin{document}@.
Your abstract should not exceed \textbf{two pages}, and it should be written in \textbf{English}.

You may use all standard environments for typing numbered and unnumbered equations in your abstract. Please, begin all labels with YOUR name.  E.g., for Peter Smith they can be psmith1, psmith2, etc. 

The list of references should be adjusted with \verb@\thebibliography@ environment. Please, begin all labels in the command \verb@\bibitem@ with YOUR name. E.g., for Peter Smith they can be psmithbib1, psmithbib2, etc. Please, use the command \verb@\cite{label}@ to cite the items. 

For example, let
\begin{equation}\label{psmith1}
A=B.
\end{equation}
From (\ref{psmith1}) we obtain
\begin{align}
B(x)=C(x) & \quad \text{for } x \in\Omega, \label{psmith2}\\  % This line is numebered
C(x)=D(x) & \quad \text{for } x\in\partial\Omega. \nonumber    % This line is unnumbered
\end{align}
To prove (\ref{psmith2}), see \cite{psmithbib2}.

You may use the environments \verb@proposition@, \verb@lemma@, \verb@theorem@, \verb@corollary@, \verb@definition@, \verb@remark@, \verb@problem@. Please, begin all labels (if necessary) with YOUR name.
\begin{theorem}\label{psmiththeorem1}
Text of the theorem. Text of the theorem. Text of the theorem. Text of the theorem. Text of the theorem. Text of the theorem. 
\end{theorem}
The  proof of Theorem \ref{psmiththeorem1} is clear.

\normalsize
\begin{thebibliography}{99}
\bibitem{psmithbib1} Author, A.: Fundamentals of Mathematics. Publisher, City (2001).
\bibitem{psmithbib2} Author, B.C.: On some properties of control systems. Journal of Math. 34, 225-227 (2025).
\end{thebibliography}

\end{document}
