fix bug

main.tex

@@ -163,7 +163,7 @@ Let $T$ be a spanning tree in the support of ideal tree packing.
 Recall that the number of inter-component edges of $T$ in $\mathcal P_F$ is $k$.
 Then we have
 \[
-\E_{F'}[|T\setminus F'|]=k\brack{1-\paren{\frac{k+1-k'}{k+1}}^2}\leq 2k'.
+\E_{F'}[|T\setminus F'|]\leq 2k \frac{k'}{k+1}\leq 2k'.
 \]
 \end{proof}