\usepackage[utf8]{inputenc} % This defines the font-encoding you prefer to use
\usepackage{fourier}
\pagestyle{headings}
\usepackage{marvosym}
\usepackage[pdftex]{graphicx}
\usepackage[margin=2.5cm]{geometry}
\usepackage{rotating}
\usepackage{amsmath}
\usepackage{booktabs}
\usepackage{url}
\usepackage{natbib}
%\usepackage[numbers]{natbib} % Use this command if you want to refer to the literature by numbers, e.g., [1]
\usepackage{setspace}
\linespread{1.2} %Changed from 1.5

\newenvironment{remark}{\par\mbox{}\par\noindent{\bfseries \emph{Remark}\/}:\normalfont}{\par}
\newenvironment{defin}{\par\mbox{}\par\noindent\bfseries \emph{\Pointinghand\ }\normalfont}{\par}
\setcounter{tocdepth}{2} 
\usepackage[colorlinks=true, a4paper=true, pdfstartview=FitV,
linkcolor=blue, citecolor=blue, urlcolor=blue]{hyperref}
\pdfcompresslevel=9