xor range

content/various/lp_dual.tex

@@ -1,3 +1,4 @@
+\begin{center}
 \begin{tabular}{c|c}
 Maximization & Minimization \\
 \hline
@@ -7,4 +8,5 @@
 Nonnegative variable $\ge$ & Inequality constraint $\ge$ \\
 Nonpositive variable $\le$ & Inequality constraint $\le$ \\
 Free variable & Equality constraint $=$ \\
-\end{tabular}
+\end{tabular}
+\end{center}