Limiting behaviour of intrinsic semi-norms in fractional order Sobolev spaces

Details Limiting behaviour of intrinsic semi-norms in fractional order Sobolev spaces Limiting behaviour of intrinsic semi-norms in fractional order Sobolev spaces

2011-11-30

arxiv.org/abs/1111.7301v1

Mathematics

Functional Analysis

LaTeX, document class is amsart, 15 pages. Submitted to Studia Mathematica

Scientific paper

We collect and extend results on the limit of $\sigma^{1-k}(1-\sigma)^k |v|_{l+\sigma,p,\Omega}^p$ as $\sigma$ tends to $0^+$ or $1^-$, where $\Omega$ is $\mathbb{R}^n$ or a smooth bounded domain, $k$ is 0 or 1, $l$ is a nonnegative integer, $p\in[1,\infty)$, and $|.|_{l+\sigma,p,\Omega}$ is the intrinsic semi-norm of order $l+\sigma$ in the Sobolev space $W^{l+\sigma,p}(\Omega)$. In general, the above limit is equal to $c[v]^p$, where $c$ and $[.]$ are, respectively, a constant and a semi-norm that we explicitly provide. The particular case $p=2$ for $\Omega=\mathbb{R}^n$ is also examined and the results are then proved by using the Fourier transform.

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