I have a set of four sub-equations, which I each want numbered and left-aligned. The second and third of these sub-equations are too long for one line so I am using the split environment to manually add line breaks with appropriate alignment where appropriate. I can't figure out how to do this.
Here's what I have now:
\begin{subequations}
\label{eq:omegai}
%
\begin{gather}
\label{eq:omega0}
\Omega_0 = \left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} > \omega_t,\ \hat{\omega}_{23} > \omega_t,\ \hat{\omega}_{31} > \omega_t \right\}
\\
%
\label{eq:omega1}
\begin{split}
\Omega_1 = &\left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} \leq \omega_t,\ \hat{\omega}_{23} > \omega_t,\ \hat{\omega}_{31} > \omega_t \right\} \\
&\cup \left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} > \omega_t,\ \hat{\omega}_{23} \leq \omega_t,\ \hat{\omega}_{31} > \omega_t \right\} \\
&\cup \left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} > \omega_t,\ \hat{\omega}_{23} > \omega_t,\ \hat{\omega}_{31} \leq \omega_t \right\}
\end{split}
\\
%
\label{eq:omega2}
\begin{split}
\Omega_2 = &\left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} > \omega_t,\ \hat{\omega}_{23} \leq \omega_t,\ \hat{\omega}_{31} \leq \omega_t \right\} \\
&\cup \left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} \leq \omega_t,\ \hat{\omega}_{23} > \omega_t,\ \hat{\omega}_{31} \leq \omega_t \right\} \\
&\cup \left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} \leq \omega_t,\ \hat{\omega}_{23} \leq \omega_t,\ \hat{\omega}_{31} > \omega_t \right\}
\end{split}
\\
%
\label{eq:omega3}
\Omega_3 = \left\{\left(\omega_{12},\omega_{23}\right) \suchthat \hat{\omega}_{12} \leq \omega_t,\ \hat{\omega}_{23} \leq \omega_t,\ \hat{\omega}_{31} \leq \omega_t \right\}
\end{gather}
%
\end{subequations}
I have tried changing gather
to align
, but I get only the first and fourth equation left-aligned and the others are smashed to the right.
Best Answer
Use
align
, notgather
:The
={}&
trick is to get\cup
a bit to the right of the brace in the upper line in thesplit
equations.I have removed all
\left
and\right
that serve no purpose here (they actually introduce unwanted spaces).