\documentclass[12pt,a4paper,leqno,draft]{article}
\usepackage{ifthen}
\usepackage{xstring}
\usepackage{authblk}
\usepackage{amsthm}%za newtheorem
\usepackage{blindtext}%za declaremathoperator
\usepackage{mathtools}%za declaremathoperator





% Define the margin widths
\setlength\textheight{8.39in}
\setlength\textwidth{6.0in}
\setlength\oddsidemargin{0.3in}
\setlength\evensidemargin{0.3in}
\setlength\topmargin{0.0in}
\setlength\headsep{0.35in}
\setlength\headheight{0.17in}
\setlength\topmargin{0.38in}
\setlength\topskip{0.14in}
\setlength\footskip{0.42in}



% Define the mathematical environments

\newtheorem{theorem}{Theorem}[section]
\newtheorem{proposition}{Proposition}[section]
\newtheorem{lemma}{Lemma}[section]
\newtheorem{corollary}{Corollary}[section]
\theoremstyle{definition}
\newtheorem{definition}{Definition}[section]
\theoremstyle{remark}
\newtheorem{remark}{Remark}[section]
\newtheorem{example}{Example}[section]


\DeclareMathOperator{\Span}{Span}
\DeclareMathOperator{\diag}{diag}
\DeclareMathOperator{\sgn}{sgn}
\DeclareMathOperator{\Si}{Si}
\DeclareMathOperator{\supp}{supp}
\DeclareMathOperator{\Co}{Co}
\DeclareMathOperator{\Pc}{Pc}
\DeclareMathOperator{\res}{Res}






\begin{document}


% PLEASE LEAVE THE TITLE CODE ON ONE LINE.
\title{Insert your own title here}



% INCLUDE AUTHOR INFORMATION IN THE FOLLOWING LINES
% PLEASE USE A DIFFERENT \author FOR EACH AUTHOR, LEAVING THEM ON SEPARATE
% LINES. PLEASE DO NOT ADD ANYTHING BEFORE \author ON THE SAME LINE.
% IN THE EXAMPLE BELOW M. SMITH AND F. SMITH ARE FROM THE SAME DEPARTMENT
% BUT A. R. SMITH IS FROM A SECOND INSTITUTE.
% THE NAMES IN []s ARE FOOTNOTES TO INSTITUTES.
% USE A '\' AFTER PERIODS AS THIS STOPS LATEX THINKING THAT THEY MARK THE END
% OF A SENTENCE.
\author[1]{Name1 Smith}
\author[2]{Name2 Smith}
\author[1]{Name3 Smith}
\affil[1]{\footnotesize  University A, Faculty A, Department A,  name1smith@example.com, name3smith@example.com}
\affil[2]{\footnotesize  University B, Faculty B, Department B,  name2smith@example.com}
\date{}


\maketitle

Insert abstract here
%Please watch out for black block to the end of any lines that extend past the text margin and correct them before submitting.

\vspace{1.5ex}



\begin{thebibliography}{}

%Please insert references here using given template

\bibitem{Borges}
C.\ F.\ Borges, {On a class of Gauss--like quadrature rules}, Numer.\ Math.\  {\bf67} (1994),  271--288.



\end{thebibliography}

\end{document} 