\documentclass[11pt , a4paper]{report}
\usepackage[all]{xy}
\usepackage{amsthm, amssymb, amsmath,amsfonts,fancyhdr,color,xspace,hyperref,latexsym,amscd,tikz}
%\usepackage{amsthm, amssymb, amsmath,amsfonts,fancyhdr,color,xspace,hyperref,latexsym,amscd,tikz} 
%\usepackage{glossaries}
\usepackage[xindy]{glossaries}
\usepackage{graphicx}
\fancyfoot{} 
\fancyfoot[C]{\thepage}
\renewcommand{\headrulewidth}{0.6pt}
\usepackage{xepersian}
\numberwithin{equation}{section}
\settextfont[Scale=1.2]{Yas} 
\setdigitfont[Scale=1.2]{Yas}
\setlatintextfont{Yas}

\begin{document}
$ a\equiv b $\\
$ a\nequiv b$\\
$ a\notequiv b$

%\documentclass[10pt,a4paper]{article}
%\usepackage[latin1]{inputenc}
%\usepackage{amsmath}
%\usepackage{amsfonts}
%\usepackage{amssymb}
%\begin{document}
\end{document}