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## Second derivative estimates

I am in big trouble since I don’t see how to proceed (I don’t need the exact calculation) with the following estimates. In one of his papers, Lin proves the following result: Let’s consider a bounded, smooth domain $\Omega$ in $\mathbb{R}^n$ and let $(a_{ij})$ be a symmetric $n$x$n$ matrix-valued function on $\Omega$ wich satisfy \$\lambda […]