# Space increase between array

Question-1

I want to increase space front side and backside of semicolon(;).

Question-2

I want to change position of y->\infty at downward side (Same as at y->0)

MWE:

\documentclass[12pt]{article}
\usepackage[a4paper,top=0.8 in,bottom=0.8 in,left=0.6 in,right=0.5 in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[misc]{ifsym}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{delarray}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{calc,shapes}
\usepackage{parskip}
\usepackage{cellspace}
\setlength\cellspacetoplimit{4pt}
\setlength\cellspacebottomlimit{4pt}
\begin{document}
\large
The associated boundary conditions are

$$\begin{array}[t].{l}\} u = U_{0} \8pt] v = V_{w} \\ [8pt] N = 0 \\ [8pt] T = T_{w} \\ [8pt] C = C_{w} \end{array}_{at\; y \,\to \,0} \begin{array}[t]{@{}c@{}}\\{}; {}\\{}\end{array} \begin{array}[t].{l}\} u \,\to\, 0\\[8pt] N \,\to\, 0\\[8pt] T \,\to\, T_{\infty}\\[8pt] C \,\to\, C_{\infty} \end{array}$$_{as\; y \,\to \,\infty} \end{document}  • You are aware that your example does not compile? For example why do you have $$...$$_{as\; y \,\to \,\infty} as the _{as\; y \,\to \,\infty} part requires math mode and \) ends inline math mode. Commented Jan 12, 2021 at 13:20 • @daleif Its compile good at my end. Commented Jan 12, 2021 at 13:31 • Are you sure? Missing  inserted. <inserted text>  l.34 \end{array}\)_ {as\; y \,\to \,\infty} Commented Jan 12, 2021 at 13:34 • If this compliles at your end (and your end is not Overleaf where a failed compilation is often overlooked) then please provide the log file from compiling exactly this MWE Commented Jan 12, 2021 at 13:35 • My end is overleaf Commented Jan 12, 2021 at 13:43 ## 2 Answers You have a subscript outside of math mode. I believe it's better to use a display and also align differently the contents. I propose both top alignment and center alignment (which I'd prefer). \documentclass[12pt]{article} \usepackage[a4paper,top=0.8 in,bottom=0.8 in,left=0.6 in,right=0.5 in]{geometry} \usepackage[utf8]{inputenc} \usepackage[misc]{ifsym} \usepackage{amsmath} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{graphicx} \usepackage{delarray} \usepackage[dvipsnames]{xcolor} \usepackage{tikz} \usetikzlibrary{calc,shapes} \usepackage{parskip} \usepackage{cellspace} \setlength\cellspacetoplimit{4pt} \setlength\cellspacebottomlimit{4pt} \begin{document} The associated boundary conditions are \[ \renewcommand{\arraystretch}{1.2} \begin{array}[t].{@{}r@{}>{{}}c<{{}}@{}l@{}}\} u &=& U_{0} \\ v &=& V_{w} \\ N &=& 0 \\ T &=& T_{w} \\ C &=& C_{w} \end{array}_{\text{as y \to 0}} \quad ; \quad \begin{array}[t].{@{}r@{}>{{}}c<{{}}@{}l@{}}\} u &\to& 0\\ N &\to& 0\\ T &\to& T_{\infty}\\ C &\to& C_{\infty} \end{array}_{\text{as y \to \infty}}
The associated boundary conditions are
$\renewcommand{\arraystretch}{1.2} \left. \begin{array}{@{}r@{}>{{}}c<{{}}@{}l@{}} u &=& U_{0} \\ v &=& V_{w} \\ N &=& 0 \\ T &=& T_{w} \\ C &=& C_{w} \end{array} \right\}_{\text{as y \to 0}} \quad ; \quad \left. \begin{array}{@{}r@{}>{{}}c<{{}}@{}l@{}} u &\to& 0\\ N &\to& 0\\ T &\to& T_{\infty}\\ C &\to& C_{\infty} \end{array} \right\}_{\text{as y \to \infty}}$
\end{document}


Here is a third possibility:

\documentclass[12pt]{article}
\usepackage[a4paper,top=0.8 in,bottom=0.8 in,left=0.6 in,right=0.5 in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[misc]{ifsym}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{delarray}
\usepackage[dvipsnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{calc,shapes}
\usepackage{parskip}
\usepackage{cellspace}
\setlength\cellspacetoplimit{4pt}
\setlength\cellspacebottomlimit{4pt}

\begin{document}
The associated boundary conditions are
\left. \begin{aligned} u &= U_{0} \\ v &= V_{w} \\ N &= 0 \\ T &= T_{w} \\ C &= C_{w} \end{aligned} \right\}\text{as y \to 0};\quad \left. \begin{aligned} u &\to 0\\ N &\to 0\\ T &\to T_{\infty}\\ C &\to C_{\infty} \end{aligned} \right\}\text{as y \to \infty}
\end{document}


• Great.. Thanks a lot sir. May I change position of as y->0, I mean can we write in center instead of below. Commented Jan 13, 2021 at 3:07
• @Snehal I added a further possibility Commented Jan 13, 2021 at 6:24
• In above last code of boundary conditions Can we give equation number? Because I have been working with lots of equations and this one is in the intermediate level. Commented Jan 19, 2021 at 7:24
• @Snehal Use $$...$$ instead of $...$ Commented Jan 19, 2021 at 8:31
• ok I understand once again thanks. Hoping that I will get benefit of your knowledge Commented Jan 19, 2021 at 15:31

In Plain TeX, we can use \eqalign{...} as a part of the math formula.

\left.\eqalign{u &= U_0\cr w &= V_w\cr N &= 0\cr T &= T_w\cr C &= C_w}\right\} _{{\rm as}\ y\,\to\,\infty} \quad ; \quad \left.\eqalign{u &\to 0\cr N &\to 0\cr T &\to T_\infty\cr C &\to C_\infty}\right\} _{{\rm as}\ y\,\to\,\infty}

\bye