کد: [انتخاب]
\documentclass{article}
\usepackage{amsthm,amssymb,amsmath}
\usepackage{xepersian}
\begin{document}
\DeclareMathDelimiter{\Norm}{\mathord}{largesymbols}{"3E}{largesymbols}{"3E}
$$T_v = \left \{ (x,y) \left\Norm\vphantom{\sum^n_{\substack{ j=1\\ j\neq p }}\lambda _{j} x_{ij} \leqslant x} \right. \sum^n_{\substack{ j=1\\ j\neq p }}\lambda _{j} x_{ij} \leqslant x \quad ,\sum^n_{\substack{ j=1\\ j\neq p }}\lambda _{j} y_{rj}\geqslant y ,\quad \lambda_ j\geqslant 0 , j\neq p \right \} $$
\end{document}