EIP 100: ommers of parent should be counted, not the direct ommers

Paper.tex

@@ -457,7 +457,7 @@ \subsubsection{Block Header Validity}
 \end{equation}
 \begin{equation*}
 x \equiv \begin{cases}
-1 & \text{if} \, \lVert B_\mathbf{U}\rVert = 0 \\
+1 & \text{if} \, \lVert P(H)_\mathbf{U}\rVert = 0 \\
 2 & \text{otherwise}
 \end{cases}
 \end{equation*}