2

Considered my little ability in English I would like to know what is the use of drcases and what are the advantages or disadvantages of this command.

\begin{drcases} 〈math_column〉 & 〈math_column〉 \end{drcases}
\begin{drcases*} 〈math_column〉 & 〈text_column〉 \end{drcases*}

See the manual of mathtools https://ctan.mirror.garr.it/mirrors/ctan/macros/latex/contrib/mathtools/mathtools.pdf § 3.4.3 More cases-like environments pag. 19.

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  • 2
    It is a cases environment with a right brace, and maths in \displaystyle.
    – Bernard
    Oct 31, 2020 at 22:16
  • @Bernard I have never used it and hadn't seen an example in the manual. I understand the controls if I see some examples. Thank you veryyyyyyyyyyyyy much.
    – Sebastiano
    Oct 31, 2020 at 22:19
  • 2
    In the answer to this question, you have an example. Please let me know if it's nos illuminating enough.
    – Bernard
    Oct 31, 2020 at 22:25
  • @Bernard With a lot of sincerity my question after that I have seen the link it is similar to a duplicate. For me it is important also to know the advantages or disadvantages of this command, if possibile. Otherwise I put close to my question. Thank youuuuuuuu.
    – Sebastiano
    Oct 31, 2020 at 22:48
  • 2
    I do think è possibile. There are cases (!) where you want a brace on the right, not on the left, e.g. when you want to denote that a series of conditions together imply some consequence. As to the d in drcases, it may happen that you want the formulæ inside the environment to be displaystyle (b.t.w. one might also want an mrcases (medium-sized) environment). (I feel like I've written enough Latin expressions…). Do these explanations make it clearer to you? Or is it a casus belli? ;o)
    – Bernard
    Oct 31, 2020 at 22:59

1 Answer 1

-1

I'll give my answer in regards to the following example:

\documentclass[]{scrartcl}
\usepackage{mathtools}
\begin{document}
  $ \lim\limits_{n \rightarrow \infty} \left| \frac{b_{n+1}}{b_{n}} \right| 
    \begin{dcases}
    \begin{rcases}
    < \\
    = \\
    > 
    \end{rcases}
    \end{dcases}
    = 1 \Rightarrow
    \sum\limits_{n =0}^{\infty} b_n
    \begin{cases}
    \text{converges absolutely} \\
    \text{???} \\
    \text{diverges absolutely} 
    \end{cases} $
\end{document}

Here drcases is used to place left and right braces on the cases. When only left brace in necessary you can use cases.

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  • 1
    Might be an idea to include an image of the result
    – daleif
    May 7, 2021 at 10:15
  • 2
    Your example does not actually use drcases. Also drcases is not used to place braces on the left and right, it puts the brace on the right side only. May 7, 2021 at 11:12
  • Thank you very much for your answer. Please, can you put a screenshot of your code, considering the comments of very nice users @MarcelKrüger and dailef. Thank you.
    – Sebastiano
    May 8, 2021 at 16:31
  • @daleif Thank you very much for your comment. I understood also the code if I see the output. My best regards.
    – Sebastiano
    May 8, 2021 at 16:31

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