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Let $\Omega \subset \mathbb{R}^N$ ($N \geq 3$) be a $C^2$ bounded domain and$K \subset \Omega$ be a compact, $C^2$ submanifold in $\mathbb{R}^N$ withoutboundary, of dimension $k$ with $0\leq k < N-2$. We consider the Schr\"odingeroperator $L_\mu = \Delta + \mu d_K^{-2}$ in $\Omega \setminus K$, where $d_K(x)= \text{dist}(x,K)$. The optimal Hardy constant $H=(N-k-2)/2$ is deeplyinvolved in the study of $-L_\mu$. When $\mu \leq H^2$, we establish sharp,two-sided estimates for Green kernel and Martin kernel of $-L_\mu$. We usethese estimates to prove the existence, uniqueness and a priori estimates ofthe solution to the boundary value problem with measures for linear equationsassociated to $-L_\mu$

Green kernel and Martin kernel of Schr\"odinger operators with singular potential and application to the B.V.P. for linear elliptic equations