\usepackage{amssymb,amsmath}
\usepackage[thmmarks,framed]{ntheorem}
\usepackage{pstricks}
\usepackage{pstricks-add}
\usepackage{xecolour}
\usepackage{colortbl}
\usepackage{sectsty}
\usepackage{xepersian}
\theoremheaderfont{\normalfont\bfseries}
\theorembodyfont{\rm}
\theoremsymbol{\ensuremath{\Box}}
\theoremseparator{:}
\newtheorem{ghaz}{قضیه}[chapter]
\newtheorem{nati}{نتیجه}[chapter]
\newtheorem{mesa}{مثال}[chapter]
\newtheorem{tari}{تعریف}[chapter]
\theoremheaderfont{\normalfont\bfseries}
\theorembodyfont{\rm}
\theoremstyle{nonumberplain}
\theoremseparator{:}
\theoremsymbol{}
\newtheorem{esba}{اثبات}
\newtheorem{hal}{حل}

\def\contentsname{فهرست}
\def\bna{\begin{nati}}
\def\ena{\end{nati}}
\def\bta{\begin{tari}}
\def\eta{\end{tari}}
\def\bha{\begin{hal}}
\def\eha{\end{hal}}
\def\bte{\begin{ghaz}}
\def\ete{\end{ghaz}}
\def\bme{\begin{mesa}}
\def\eme{\end{mesa}}
\def\bes{\begin{esba}}
\def\ees{\end{esba}}
\newcommand{\bt}{\begin{tabular}}
\newcommand{\et}{\end{tabular}}
\newcommand{\norm}[1]{\|#1\|}
\newcommand{\mo}{^c} 
\def\ham{\equiv}
\def\dis{\displaystyle}
\def\chii{\raise.5mm\hbox{$\chi$}}
\def\lhde{\triangleleft}
\def\le{\leqslant}
\def\dar{\times}
\def\ge{\geqslant}
\def\fee{\varphi} 
\def\tr{\triangledown}
\def\zi{\subseteq}
\def\zia{\subset}
\newcommand{\bor}[1] {\stackrel{\longrightarrow}{#1}}
\newcommand{\jam}[2]{\sum_{#1}^{#2}}
\newcommand{\ej}[2]{\cup_{#1}^{#2}}
\newcommand{\es}[2]{\cap_{#1}^{#2}}
\newcommand{\ejb}[2]{\bigcup_{#1}^{#2}}
\newcommand{\esb}[2]{\bigcap_{#1}^{#2}}
\def\ra{\longrightarrow}
\def\ca{\longleftarrow}
\def\nat{\Rightarrow}
\def\natn{\Leftrightarrow}
\def\eps{\varepsilon}
\def\del{\delta} 
\def\bc{\begin{center}}
\def\ec{\end{center}}
\def\tag{\thickapprox}
\def\ba{\begin{array}}
\def\ea{\end{array}}
\def\be{\begin{enumerate}}
\def\ee{\end{enumerate}}
\def\beq{\begin{eqnarray*}}
\def\eeq{\end{eqnarray*}}
\def\ya{\vee}
\def\va{\wedge}
\def\Bbb{\mathbb}
\setlength\fboxsep{3mm}
\def\foo{\footnotesize}
\newcounter{ali}[section]
\newcommand{\she}[1]{\refstepcounter{ali}
\label{#1}{\scriptsize\mbox{
شکل
}}\ref{#1}}
\newcounter{alii}[section]
\newcommand{\sho}[1]{\refstepcounter{alii}
\label{#1}\ref{#1}}
\def\tohi{\varnothing}
\def\toh{\varnothing}
\def\Rr{{\cal R}}
\def\Tt{{\cal T}}
\def\Ss{{\cal S}}
\def\Aa{{\cal A}}
\def\Bb{{\cal B}}
\def\Cc{{\cal C}}
\def\Dd{{\cal D}}
\def\Gg{{\cal G}}
\def\Ff{{\cal F}}
\def\nto{\leftarrow}
\def\dak{\mbox{ Int}}
\newcommand{\da}[1]{#1^\circ}
\def\ka{\mbox{ Ext}}
\def\b{\mbox{ b}}
\def\ma{\b}
\newcommand{\bast}[1]{\overline{#1}} 
\def\RR{\Bbb R}
\def\NN{\Bbb N}
\def\ZZ{\Bbb Z}
\def\QQ{\Bbb Q}
\def\tp{توپولوژی‌ }
\def\th{توپولوژی‌های }
\def\ft{فضای توپولوژیک‌ }