I'm trying to create a system of equations with sub-numbering using the \begin{subnumcases} environment. Everything works perfectly but I would need to place a label somewhere in order to ref the system itself using the main number assigned to it, without having to ref one equation of it.
This is my code:
\documentclass{book}
\usepackage{cases}
\begin{document}
\begin{subnumcases}{}\label{eq:system}
\frac{d\psi}{d\zeta} = \frac{m_1}{y_1\prime}(x_1-\beta y_1\prime) \label{eq:dpsidz}
\\*
\frac{dx_i}{d\zeta} = \frac{m_i}{\psi y_i\prime}(x_i-y_i\prime)(x_i-\beta y_i\prime) \qquad \forall i=1,...,C-1 \label{eq:dxdz}
\\*
0 = y_1\prime (x_j-\beta y_j\prime)-\alpha_{1j}y_j\prime(x_1-\beta y_1\prime) \qquad \forall j=2,...,C \label{eq:algeb1}
\\*
0 = \sum_{i=1}^{C}y_i\prime -1 \label{eq:algeb2}
\\*
\psi|_{\zeta=0} = 1
\\*
x_i|_{\zeta=0} = x_i^F \qquad \forall i=1,...,C
\end{subnumcases}\\
The system illustrated in \ref{eq:system} is a \textsc{dae} system with a differential index equal to 1.
\end{document}
As you can see, I've tried to place the label{eq:system} inside the environment, before the first equation, but when I ref it in text it appears the name of the first equation. If the system equations are labelled 1.1a, 1.1b etc., I would like to ref the system as 1.1. I hope I was clear in explaining my issue. Thank you