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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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    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
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    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
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    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

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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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    Might be an idea to include an image of the result
    – daleif
    May 7, 2021 at 10:15
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    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.
    – Marcel Krüger
    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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