Inverse Problems for Fractional Semilinear Elliptic Equations
摘要
In this chapter, we study the inverse problem for the fractional semilinear equation with the exterior Dirichlet data of the form \(\displaystyle \begin {cases} (-\varDelta )^{s}u+a(x,u)=0 & \mbox{ in }\varOmega ,\\ u=f & \mbox{ in }\varOmega _{e}, \end {cases} \) where \(s\in (0,1)\) . A standard technique to handle nonlinear equations is to differentiate the equation to obtain a useful linear equation, and there are various ways for this purpose. We introduce higher-order linearization method so that one can prove the global uniqueness of certain nonlinear equations. Moreover, thanks to the nonlocality, we can also demonstrate a uniqueness result, without using any linearization scheme.