\usepackage[all]{xy}
\usepackage{amsmath,amsthm,amssymb,graphicx,tikz,fancyhdr,hyperref,natbib} 
\usepackage{graphicx,hyperref,fancyhdr,amsmath,amssymb,mathrsfs,color,xspace,pdflscape}
%%%%%%%%%%%%%%%%%%%% دستور رنگی کردن لینک‌ها %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\hypersetup{colorlinks=true,linkcolor=red,citecolor=blue,filecolor=magneta,urlcolor=cyan}
\usepackage{fancyhdr}
\usepackage{geometry}
\geometry{verbose,a4paper, tmargin=3cm, bmargin=2.5cm, lmargin=3cm, rmargin=3cm, footskip=1.5cm}
\usepackage{xepersian}
\settextfont[Scale=1]{Yas}
\setdigitfont[Scale=1.1]{Yas}
\setlatintextfont{Times New Roman}
\linespread{1.8}
\newtheorem{dfn}{تعریف}[section]
\newtheorem{thm}[dfn]{قضیه}
\newtheorem{pro}[dfn]{گزاره}
\newtheorem{rem}[dfn]{توجه}
\newtheorem{lem}[dfn]{لم}
\newtheorem{cor}[dfn]{نتیجه}
\newtheorem{eg}[dfn]{مثال}
\newtheorem{qu}[dfn]{سوال}
\newtheorem{con}[dfn]{ساخت}
\newtheorem{alg}{الگوریتم}
\renewenvironment{proof}{\noindent{\bf اثبات. }  \rm } {\hfill{$\Box$}\\}
\renewcommand{\bibname}{مراجع}
\fancyhead[RE]{\thepage}
\fancyhead[LO]{\thepage}
\fancyfoot{\empty} 
\pagestyle{fancy}
\newcommand{\Lfootnote}[1]{\hspace{-1mm}\LTRfootnote{\rm #1}~}
\numberwithin{equation}{section}