# Adding a large brace before a body of text

How to write the above using Latex ?

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You are searching for the cases environment from »amsmath«. – Thorsten Donig Nov 19 '13 at 8:26
Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – Jubobs Nov 19 '13 at 8:30
You might also be interested in: tex.stackexchange.com/questions/115360/… [It deals with the same mathematical equation (-; ] – jmc Nov 19 '13 at 8:49
@Jubobs Thanks for your welcome. – Suman Nov 19 '13 at 15:30

You can use cases environment from amsmath package.

The code that illustrates how to do it is

\documentclass{article}

\usepackage{amsmath}

\begin{document}
$P_v(E/k,T) = \begin{cases} 1 & \text{if T\geq 0} \\ 0 & \text{if T = 0} \\ -1 & \text{if T\rightarrow\infty} \end{cases}$
\end{document}

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\text{if $T\geq 0$} is even better. The infinity symbol's name is \infty. – egreg Nov 19 '13 at 9:12
@egreg: Thank you very much for your comment! I have just edited my answer! – Thanos Nov 19 '13 at 11:23
\documentclass[preview,border=12pt,12pt]{standalone}% change it back to your own document class
\usepackage{amsmath}
\usepackage{array}
\begin{document}
$P_v(E/k,T)= \begin{cases} 1-a_vT+N_{k/Q}(v)T^2, & \mbox{good reduction} \\ 1-T, & \mbox{split multicative reduction}\\ 1+T, & \mbox{non split multicative reduction}\\ 1, & \mbox{aditive reduction} \end{cases}$
\end{document}


Out put will look like

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With mathtools package you have the cases* environment which sets the second column in text mode, so you don't have to write —in this case— \mbox{…}. – Manuel Nov 19 '13 at 9:08
@Manuel cases* is available only with mathtools. Instead of \mbox I'd use \text. – egreg Nov 19 '13 at 9:11
@egreg Isn't that what I said? :) And I also use \text, but I don't know in what cases I should use \mbox? – Manuel Nov 19 '13 at 9:23
\text will also give same output as \mbox, and I don't know the real difference between this two command. – Apurba Nov 19 '13 at 12:52
\text adapts to the surrounding text style. If you are in a theorem with the font set in sans serif, italics and small caps (if that exists :D), then if you use \text you will get that same style. – Manuel Nov 20 '13 at 12:01