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% Journal LaTeX Template
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\documentclass[11pt,twoside,a4paper]{article}

%----------------------------------------------------
% Page Layout
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\usepackage[left=1.7cm,right=1.7cm,top=3cm,bottom=4cm]{geometry}
\setlength{\textheight}{23cm}
\setlength{\textwidth}{13.5cm}

%----------------------------------------------------
% Packages
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\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath,amsfonts,amssymb,amsthm}
\usepackage{graphicx}
\usepackage{float}
\usepackage{enumitem}
\usepackage{cite}
\usepackage{xcolor}
\usepackage[pdftex]{hyperref}
\usepackage{fancyhdr}
\usepackage{apacite}
\hypersetup{colorlinks=true, linkcolor=blue, citecolor=blue, urlcolor=blue}

\setcounter{MaxMatrixCols}{30}
\sloppy

%----------------------------------------------------
% Header & Footer
%----------------------------------------------------
\pagestyle{fancy}
\fancyhf{}
\fancyhead[LE,RO]{\thepage}
\fancyhead[LO]{\textit{Running Title Here}}
\fancyhead[RE]{\textit{Author Name(s)}}


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

%----------------------------------------------------
% Title Information
%----------------------------------------------------
\title{\textbf{TITLE OF THE PAPER}}

\author{
Author One\thanks{Affiliation of Author One, Email: author1@email.com}
\and
Author Two\thanks{Affiliation of Author Two, Email: author2@email.com}
}

\date{}

%====================================================
\begin{document}
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\maketitle

%----------------------------------------------------
% Abstract
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\begin{abstract}
\noindent
Write your abstract here. The abstract should clearly state the objective, methods, and main results of the paper.
\end{abstract}

\noindent\textbf{Keywords:} keyword1; keyword2; keyword3.

\noindent\textbf{MSC (2020):} Primary 00A00; Secondary 00B00.

%----------------------------------------------------
\section{Introduction}
Provide an introduction to the problem, including background, motivation, and relevant literature.

\section{Preliminaries}
Include necessary definitions and known results.

\begin{definition}
Sample definition.
\end{definition}

\begin{theorem}
Sample theorem statement.
\end{theorem}

\begin{proof}
Provide the proof here.
\end{proof}

\section{Main Results}
Present your main findings.

\begin{lemma}
Sample lemma.
\end{lemma}

\begin{proof}
Proof of the lemma.
\end{proof}

\section{Conclusion}
Summarize the results and possible future work.

%----------------------------------------------------
% Acknowledgment (Optional)
%----------------------------------------------------
\section*{Acknowledgment}
The authors would like to thank ...

%----------------------------------------------------
% References
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% References (APA Style)
%----------------------------------------------------
\bibliographystyle{apacite}

% If using BibTeX, uncomment the following line and provide your .bib file
% \bibliography{references}

% Example manual entries (if not using BibTeX)
\begin{thebibliography}{}

\bibitem[Author(2024)]{ref1}
Author, A. A. (2024). Title of the article. \textit{Journal Name}, \textit{12}(3), 123--145. https://doi.org/xxxxx

\bibitem[Author \& Coauthor(2023)]{ref2}
Author, A. A., \& Coauthor, B. B. (2023). Title of the book. Publisher.

\end{thebibliography}

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\end{document}
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