# Complex alignment in equation

Why there is no space between the text ("Min/Max", "Subject to") and fm(x) and hk(x). What's wrong?

\left. \begin{aligned} \text{Min/Max} & f_m (x), & m=1,2,...,M; \\ \text{Subject to} & h_k (x) \geq 0, & k=1,2,...,K; \\ & g_j (x)=0, & j=1,2,...,J; \\ & x_i^{(L)} \leq x_i \leq x_i^{(U)}, & i=1,2,...,n. \end{aligned} \right\} \qquad


Ed.:

Thanks for recommendations. How it should be:

\left. \begin{aligned} &\text{Min/Max} && f_m (x), & m=1,2,...,M; \\ &\text{Subject to} && h_k (x) \geq 0, & k=1,2,...,K; \\ &&& g_j (x)=0, & j=1,2,...,J; \\ &&& x_i^{(L)} \leq x_i \leq x_i^{(U)}, & i=1,2,...,n. \end{aligned} \right\} \qquad


• Because TeX adds no space between ordinary symbols in math mode. – egreg Jul 22 at 12:03
• So why "&" doesn't work? – vladpopovcev Jul 22 at 12:29
• It works as expected. Use \text{Subject to } and \text{Min/Max }. – egreg Jul 22 at 12:30
• Because you should have 3 & for two alignment points. – Bernard Jul 22 at 12:30
• There are three alignment points, so 3x2 - 1 & per line. You're missing the extra on on the right – daleif Jul 22 at 12:45

I propose this simple code, and a slightly different alignment, with empheq and alignedat:

\documentclass{article}

\usepackage{empheq}
\DeclareMathOperator{\MinMax}{Min/Max}

\begin{document}
\begin{empheq}[right=\enspace\empheqrbrace]{equation}
\begin{alignedat}{2}
\MinMax f_m (x)&, &\enspace & m=1,2,...,M; \\[1ex]
\text{Subject to}& & & h_k (x) \geq 0, \enspace k=1,2,...,K; \\
& & & g_j (x)=0, \enspace j=1,2,...,J; \\
& & & x_i^{(L)} \leq x_i \leq x_i^{(U)}, \enspace i=1,2,...,n.
\end{alignedat}
\end{empheq}

\end{document}