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In this paper, we prove the Malgrange-Ehrenpreis theorem for nonlocalSchr\"odinger operators $L_K+V$ with nonnegative potentials $V\inL^q_{\loc}(\BR^n)$ for $q>\f{n}{2s}$ with $0<s<1$ and $n\ge 2$; that is to say,we obtain the existence of a fundamental solution $\fe_V$ for $L_K+V$satisfying \begin{equation*}\bigl(L_K+V\bigr)\fe_V=\dt_0\,\,\text{ in $\BR^n$}\end{equation*} in the distribution sense, where $\dt_0$ denotes the Diracdelta mass at the origin. In addition, we obtain a decay of the fundamentalsolution $\fe_V$.

The Malgrange-Ehrenpreis theorem for nonlocal Schr\"odinger operators with certain potentials