0

Good morning!

How can I do this?

enter image description here

Thank's a lot!!!

EDIT

The below answer has this problem: enter image description here

2

I would start with

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{displaymath}
  \text{If}\Rightarrow
  \begin{cases}
    \text{Conclusion }1, & a=1\\
    \text{Conclusion }2, & a=2\\
    \text{Conclusion }3, & a=3
  \end{cases}
\end{displaymath}
\begin{displaymath}
  \left.
    \begin{array}{@{}r@{}}
      \text{If }1\\
      \text{If }2\\
      \text{Longif }3
    \end{array}
  \right\}
  \Rightarrow\text{Conclusion}
\end{displaymath}
\end{document}

enter image description here

EDIT

To have the cases in an itemize as described in the question edit, use $...$ instead of displayed equation. However, I am not sure it is a good idea to have this type of case brackets in an itemization, it looks a bit strange.

\begin{itemize}
\item If $\Rightarrow$ Conclusion
\item $\left.
    \begin{array}{@{}r@{}}
      \text{If }1\\
      \text{If }2\\
      \text{Longif }3
    \end{array}
  \right\}
  \Rightarrow\text{Conclusion}$
\end{itemize}

enter image description here

  • This seems very good, but I have problem with itemize. – Kώστας Κούδας Jun 4 '18 at 7:33
  • @ΚώσταςΚούδας You can use a minipage in before the brace. See edit. – StefanH Jun 4 '18 at 7:50
  • I 'm sorry... I didn't explain it well. I have problem when it is part of itemizing, as you can see at my edited answer. – Kώστας Κούδας Jun 4 '18 at 8:34
  • @ΚώσταςΚούδας I have changed the edit. – StefanH Jun 4 '18 at 10:42
  • Thank's a lot! You are right about the strange looking of cases in itemization. I 'm thinking about it! Thank's!!! – Kώστας Κούδας Jun 6 '18 at 5:44

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