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I have been trying to align the "<" and ">" after t_{c} with that of the equal "=" sign in the second matrix (see the codes below). Any ideas on how I can do that?

enter image description here

I'm using the following codes:

    \begin{equation}
        \begin{aligned}
\sigma(t_{c})=\left\{\begin{matrix}
    1\\ [0,1] 
    \\ 
    0
\end{matrix}\right.\text{if } t_{c} \left\{\begin{matrix}
    < \\ 
    =\sfrac{-\alpha N(m_{c},m_{e})}{v_{c}^{d}}.\\ 
    >
\end{matrix}\right.\label{eqn:13}

1 Answer 1

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\documentclass{article}
\usepackage{amsmath}
\usepackage{nicefrac}

\begin{document}
    \begin{equation}\label{eqn:13}
\sigma(t_{c}) = \begin{cases}
        1       &   \\
        [0,1]   &  \text{ if } t_c \\
        0       &   \\
                \end{cases}%  
    \begin{cases}    
        < \\
        = \nicefrac{-\alpha N(m_{c},m_{e})}{v_{c}^{d}} .\\
        >
    \end{cases}
    \end{equation}
\end{document}

enter image description here

4
  • I was wondering what's the difference between \sfrac and \nicefrac.
    – OGC
    Commented Mar 1, 2021 at 8:11
  • @OGC, you not provide MWE, so I don't know, where \sfrac{...}{...} is defined, however the nicefrac packages (for which I'm aware) define \nicefrac{...}{...} which produce similar fraction as you shown on image. You can replace them with your definition if you more prefer them.
    – Zarko
    Commented Mar 1, 2021 at 8:15
  • @Zarko: \sfrac is defined by the xfrac package (l3packages bundle).
    – Bernard
    Commented Mar 1, 2021 at 9:13
  • @Bernard, thank you very much for info!
    – Zarko
    Commented Mar 1, 2021 at 9:19

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