1

This question already has an answer here:

So, i have this code:

\begin{align}
S(t+\Delta) &= S(t)-\beta S(t)I(t)\Delta + \phi R(t) \Delta \label{S}\\
I(t+\Delta) &= I(t) + \beta S(t)I(t) \Delta - \gamma I(t) \Delta \label{I}\\
R(t+\Delta) &= R(t) + \gamma I(t)\Delta - \phi R(t)\Delta \label{R} \end{align}

I want this with the numbering after every line (i already have that); but i want an '{' in front of the three lines. Is that possible?

marked as duplicate by barbara beeton, TeXnician, user156344, user36296, Mensch Mar 31 at 15:00

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

4

From this answer:

\documentclass{article}
\usepackage[overload]{empheq} % (already load amsmath)
\begin{document}
ABC
\begin{align}[left=\empheqlbrace]
S(t+\Delta) &= S(t)-\beta S(t)I(t)\Delta + \phi R(t) \Delta \label{S}\\
I(t+\Delta) &= I(t) + \beta S(t)I(t) \Delta - \gamma I(t) \Delta \label{I}\\
R(t+\Delta) &= R(t) + \gamma I(t)\Delta - \phi R(t)\Delta \label{R}
\end{align}
From equation \eqref{S}, \eqref{I} and \eqref{R}, we have blah blah blah
\end{document} 

enter image description here

  • The referenced question is already listed as a duplicate to Separate labels in cases. So this question should probably also be marked a duplicate. – barbara beeton Mar 31 at 14:03
  • @barbarabeeton I do think this question is a duplicate of the linked question, but not Separate labels in cases. – user156344 Mar 31 at 14:20

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