Update:
How do I align both the \sum
signs and the =
signs in the last two equations? I have updated the picture.
Original Question:
When I use the following code:
\begin{equation}
\begin{split}
\label{eq:BILP}
\mathpzc{I}^* & = \argmax_{\mathcal{I}} \; \left\{\sum_{i\in \mathcal{V}} \left(\theta_K \cdot \mathbb{I}_{i,j}(1,1) + \theta_K \cdot \mathbb{I}_{i,j}(0,0) \right) + \right.\\
& \qquad \qquad \quad \;\,\;\; \left. \sum_{i\in \mathcal{E}} \theta_{i_0} \cdot \mathbb{I}(x_i=0) + \theta_{i_1} \cdot \mathbb{I}(x_i=1) \right\}\\
& \qquad \qquad \text{s.t.} \; \; \sum_{x_j} \mathbb{I}_{i,j}(1,x_j) = \mathbb{I}(x_i=1) \\
& \qquad \qquad \qquad \sum_{x_i}\mathbb{I}_{i,j}(x_i,1) = \mathbb{I}(x_j=1) \\
& \qquad \qquad \qquad \sum_{x_i,x_j}\mathbb{I}_{i,j}(x_i,x_j) = 1 \\
%& \;\psi_{\mathrm{SAT}}\left(\mathbf{s}, \mathbf{l}\right) = 1
\end{split}
\end{equation}
I get the following (note the misalignment between the \sum
signs, and the =
signs highlighted under the red lines):
How can I get them to align? (and avoid using all the artificial \qquad
, \,
\;
spaces)
Best Answer
Use the
\bigg
variety for bigger delimiters and align the sums. There's a subtlety for the last one, since the long subscript would shift it to the right and\mathclap
frommathtools
avoids it.