Non-solvability in the flat category of elliptic operators with real analytic coefficients

Martino Fassina, Yifei Pan

Let $\Omega \subset {\mathbb{R}}^n,n\ge 2$, be an open set. For an elliptic differential operator $L$ on $\Omega$ with real analytic coefficients and a point $p\in \Omega$, we construct a smooth fun…