報告人:劉祖漢 教授
報告題目:Dimension estimates of the singular set for a fractional MEMS problem
報告時間:2026年4月13日(周一)上午9:00
報告地點:云龍校區6號樓304報告廳
主辦單位:數學與統計學院、數學研究院、科學技術研究院
報告人簡介:
劉祖漢,揚州大學教授,博士生導師。歷任揚州大學數學科學學院院長,江蘇師范大學黨委常委、副校長,揚州大學黨委常委、副校長、副書記;2018年10月至2022年8月任鹽城工學院黨委書記。長期從事偏微分方程的研究,多次參加國家自然科學基金項目會議評審,在SIAM J. Math. Anal.,J. Funct. Anal.,SIAM J. Appl. Math., JDE,CVPDE,European J. Applied. Math.等重要國際數學期刊上發表研究論文100余篇。
報告摘要:
We consider the following semilinear elliptic equation involving the fractional Laplacian
\begin{eqnarray*}(-\triangle)^su=-u^{-p} \hbox{~~in~} B_1,\end{eqnarray*}
where $p>1$, $s\in(0,1)$, $(-\triangle)^s$ is the $s$-Laplacian and $B_1=B_1(0)$ is the unit ball in $\mathbb{R}^N$. We first establish an optimal H\{o}lder regularity estimate for solutions by using blow-up analysis and Liouville-type theorems. Subsequently, we give a convergence result for sequences of solutions with uniform H\{o}lder continuity. These results are also used to show that the Hausdorff dimension of the rupture set $\{u=0\}$ satisfies:
$\dim_{\mathcal{H}} \{u=0\} \leq N-2 \hbox{~if~} \frac{p+1}{2p}<s<1;$< p="">
$\dim_{\mathcal{H}} \{u=0\} \leq N-1 \hbox{~if~} 0<s\leq\frac{p+1}{2p}$.< p="">
In particular, the latter one is a new phenomenon arising from the fractional Laplacian.