Equation 18.39.2145C74FFDD88

\begin{equation} \begin{gathered} \varphi =c\log \left(|x|^2+\sum _{j=1}^ r|w_ j|^2\right)+O(1),\\ Z=\{ x=0\} ,\qquad Y=\{ x=w_1=\cdots =w_ r=0\} , \end{gathered} \end{equation}