Symmetry of positive solutions to biharmonic Lane-Emden equation with singular set

In this paper, we are devoted to studying the positive weak, punctured or distributional solutions to the biharmonic Lane-Emden equation \begin{equation*} Δ^{2} u=u^{p} \quad \quad $\text{in}$ \ $\mathbb{R}$^{N}\setminus Z, \end{equation*} where $N\ge 5$, $1<p\le \frac{N+4}{N-4}$, and the singular set $Z$ represents a closed and proper subset of $\{x_1=0\}$. The symmetry and monotonicity properties of the singular solutions will be given by taking advantage of the moving plane method and the approach of moving spheres.