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\title{Title}



\author{Author \#1\\

Affiliation \\e-mail: \\

Author \#2\\

Affiliation\\

e-mail:

}

\date{10th Pan African Congress of Mathematicians, 2--7/08/2021, Brazzaville, Republic of Congo}

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\noindent{\it Keywords: Please give maximum 5 keywords}

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\textbf{\Large Abstract}\\



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\noindent

Please, use maximum 300 words, do not use any macros, special environments or definitions. For references, please use \cite{A}.





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