Analytic extension of ultradifferentiable Whitney jets

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Jean , 1940- Schmets
Manuel , 1928- Valdivia
Let $\omega$ be a weight and $F$ be a closed proper subset of $\mathbb{R}^n$. Then for every function $f$ on $\mathbb{R}^n$ belonging to the non quasi-analytic ($\omega$)-class of Beurling (resp. Roumieu) type, there is an element $g$ of the same class which is analytic on $\mathbb{R}^n \setminus F$ and such that $D^\alpha f(x) = D^\alpha g(x)$ for every $\alpha\in\mathbb{N}^n_0$ and $x\in F$.

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Schmets, Jean , 1940-; and Valdivia, Manuel , 1928-. “Analytic extension of ultradifferentiable Whitney jets”. Collectanea Mathematica, vol.VOL 50, no. 1, pp. 73-94, https://raco.cat/index.php/CollectaneaMathematica/article/view/56476.