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I want to write simultaneous equations so I used empheq environment:

\documentclass{jsarticle}
\usepackage{empheq}

\begin{document}
\begin{empheq}[left=\empheqlbrace]{align*}
E_1 = V_1 + V_2 \\
V_2 - V_3 = 0
\end{empheq}
\begin{empheq}[left=\empheqlbrace]{align*}
E_1 &= R_1I_1 + R_2I_2 \\
0   &= R_2I_2 - R_3I_3
\end{empheq}
\end{document}

However, left brace become small.

enter image description here

How can I make it the appropriate size?

Edit: Append preamble to code

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  • Completing your code with a minimal preamble, I have no such problem. Just in case, what's your version of empheq?
    – Bernard
    May 29, 2021 at 15:52
  • I also tested with minimal preamble, and it seems that using jsarticle is the cause. In article, I have no such problem. I write the report with Japanese, I must use jsarticle...
    – kobi32768
    May 29, 2021 at 16:11
  • 2
    How should we know you're using jsarticle when you don't provide a full minimal example
    – daleif
    May 29, 2021 at 16:55

1 Answer 1

2

[cw non-answer I will delete once OP provides an example]

Please provide a small test file like the following that shows the problem. I used jsarticle and platex2e but did not get the output that you show

enter image description here

\documentclass{jsarticle}
\usepackage{empheq}
\begin{document}

\begin{empheq}[left=\empheqlbrace]{align*}
E_1 = V_1 + V_2 \\
V_2 - V_3 = 0
\end{empheq}
\begin{empheq}[left=\empheqlbrace]{align*}
E_1 &= R_1I_1 + R_2I_2 \\
0   &= R_2I_2 - R_3I_3
\end{empheq}
\end{document}
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