4

I am trying to put big rounded brackets around some text that contains math formulas:

Jede Teilfolge hat entweder unendliche viele Elemente von $\left( g_{2n}\right)$ oder $\left( g_{2n+1}\right)$.\todo{Add big bracket}
\[\left. {\begin{array}{*{20}{c}}
{{g_ + } = \lim {a_n} = \lim {g_{2n}} = g}\\
{{g_ + } = \lim {b_n} = \lim {g_{2n}} = g}
\end{array}} \right\}{g_ + } = {g_ - } \Rightarrow \lim {g_n} = g = {g_ - } = {g_ + } = \frac{{1 + \sqrt 5 }}{2}\]

The result that I am looking for is something along these lines:

( First Line  )
( Second Line )
( Third Line  )

All of the solutions that I have found force me to go into mathmode, clashing with the formulas, or they use tikz in an enumerated list, which I haven't been able to adapt to my situation.

Thanks in advance for your help!

EDIT: Looks like I didn't explain myself too well. Here something I sketched up, hope this explains it better: quickMockup

Of course the brackets should be as tall as the text, and not go over like in my sketch

  • Your write-up is a bit confusing: The code you've posted features a single right-hand-side curly brace, yet you also state that you want large "rounded brackets" (same as parentheses?) on both sides of the multiline expression. Please clarify. – Mico Jun 24 '14 at 21:21
  • What I am trying to do is wrap the above code inside of parenthesis, so to enclose the whole thing, like you would do with \left( and \right) when in mathmode – ruben1691 Jun 24 '14 at 22:05
  • What I do not understand is that you mention using parentheses as in math mode, but all your formulae are maths. So where is the problem, exactly? – Bernard Jun 24 '14 at 22:46
6

You need the rcases or drcases environment from mathtools:

\documentclass{article}
\usepackage{mathtools}

\begin{document}

Jede Teilfolge hat entweder unendliche viele Elemente von $(g_{2n})$ oder
$(g_{2n+1})$.
\[
\begin{drcases}
g_+ = \lim a_n = \lim g_{2n} = g\\
g_+ = \lim b_n = \lim g_{2n} = g
\end{drcases}
g_+ = g_- \Rightarrow \lim g_n = g = g_- = g_+ = \frac{1 + \sqrt{5}}{2}
\]

\end{document}

Note that you're using too many braces; also there's no need to have \left or \right before all delimiters: it's even discouraged, as it affects spacing.

Usually I also recommend to always have braces around subscripts and superscripts, even if they are only one token, but an experienced user knows when to sin against this “rule”.

enter image description here

I wouldn't use brackets around the whole construction, but the document is yours; here is how you can do it:

\documentclass{article}
\usepackage{mathtools}
\usepackage{lipsum} % just for the example
\newsavebox{\tempbox}

\begin{document}
\lipsum*[2]
\[
\sbox{\tempbox}{%
  $\displaystyle
    \begin{drcases}
    g_+ = \lim {a_n} = \lim g_{2n} = g\\
    g_+ = \lim {b_n} = \lim g_{2n} = g
    \end{drcases} 
    g_+ = g_- \Rightarrow \lim g_n = g = g_- = g_+ = \frac{1 + \sqrt{5}}{2}
  $%
}
\begin{pmatrix}
\,\parbox[b]{\wd\tempbox}{
  Jede Teilfolge hat entweder unendliche viele Elemente von
  $(g_{2n})$ oder $(g_{2n+1})$.
}\hfill\, % left alignment
\\[\abovedisplayskip]
\,\usebox{\tempbox}\,
\end{pmatrix}
\]
\lipsum[3]
\end{document}

enter image description here

  • You are right, I should have used the notation you used in your code, but I haven't really had the time to go back and change all my code to the correct one. The one I posted above was generated ages ago using MathType, since I didn't know a better way! – ruben1691 Jun 25 '14 at 9:10

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