Description of traces of functions in the Sobolev space with a~Muckenhoupt weight

A. I. Tyulenev

Trudy Matematicheskogo Instituta imeni V.A. Steklova, Function spaces and related problems of analysis, Tome 284 (2014), pp. 288-303.

Résumé

We characterize the trace of the Sobolev space $W_p^l(\mathbb R^n,\gamma)$ with $1$ and weight $\gamma\in A_p^\mathrm{loc}(\mathbb R^n)$ on a $d$-dimensional plane for $1\le d$. It turns out that for a function $\varphi$ to be the trace of a function $f\in W_p^l(\mathbb R^n,\gamma)$, it is necessary and sufficient that $\varphi$ belongs to a new Besov space of variable smoothness, $\overline B{}_p^l(\mathbb R^d,\{\gamma_{k,m}\})$, constructed in this paper. The space $\overline B{}_p^l(\mathbb R^d,\{\gamma_{k,m}\})$ is compared with some earlier known Besov spaces of variable smoothness.

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