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@@ -31,7 +31,7 @@ Let $S_G$ be the set computed by the greedy algorithm and define $i^*$:
\end{displaymath}
then the following inequality holds:
\begin{displaymath}
-OPT(V,\mathcal{N},B) \leq \frac{e}{e-1}\big( 3 V(S_G) + 2 V(i^*)\big)
+OPT(V,\mathcal{N},B) \leq \frac{e}{e-1}\big( 3 V(S_G) + 2 V(i^*)\big).
\end{displaymath}
\end{lemma}