Giannotti, Cristina:
On the range of elliptic operators discontinuous at one point
Bollettino dell'Unione Matematica Italiana Serie 8 5-B (2002), fasc. n.1, p. 123-129, Unione Matematica Italiana (English)
pdf (234 Kb), djvu (101 Kb). | MR1881447 | Zbl 1178.47032
Sunto
Si considerano operatori uniformemente ellittici del secondo ordine in forma non variazionale, $L$, a coefficienti misurabili e limitati in $\mathbb{R}^{d}$ ($d \geq 3$) e continui in $\mathbb{R}^{d} \setminus \{0\}$ e si prova il seguente risultato: se $\Omega\subset \mathbb{R}^{d}$ è un dominio limitato, allora $L(W^{2, p}(\Omega))$ è denso in $L^{p}(\Omega)$ per ogni $p\in (1, d/2]$.
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