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\documentclass[10pt,a4paper,twoside]{article}

\usepackage{latexsym,amssymb}

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\newtheorem{theo}{Theorem}

\newtheorem{defi}[theo]{Definition}

\newtheorem{axio}[theo]{Axiom}

\newtheorem{clai}[theo]{Claim}

\newtheorem{coll}[theo]{Collorary}

\newtheorem{lemm}[theo]{Lemma}

\newtheorem{conj}[theo]{Conjecture}

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\newcommand{\proof}{\noindent{\bf Proof:}\hspace{0.2cm}}

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%\markboth{13th Joint Conference on Mathematics and Computer Science,% 
%October 1 -- 3, 2020, ELTE,  Hungary}
%{13th Joint Conference on Mathematics and Computer Science,
%October 1 -- 3, 2020, ELTE, Hungary}
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\begin{document}
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\begin{center}{\Large\bf
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\begin{center}{\large\bf\noindent
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}\\[2mm]
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write the department(s) and the university(ies) here
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\\[1mm]\texttt{
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write the e-mail address(es) here
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\vspace*{7mm}
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\begin{thebibliography}{9}
\bibitem{1.} 
....first item
\bibitem{2.} 
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....more items
\end{thebibliography}
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\end{document}







