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Article overview
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Sobolev spaces on p.c.f. self-similar sets: boundary behavior and interpolation theorems | Shiping Cao
; Hua Qiu
; | Date: |
14 Feb 2020 | Abstract: | We study the Sobolev spaces $H^sigma(K)$ and $H^sigma_0(K)$ on p.c.f.
self-similar sets in terms of the boundary behavior of functions. First, for
$sigmain mathbb{R}^+$, we make an exact description of the tangents of
functions in $H^sigma(K)$ at the boundary. Second, we characterize
$H_0^sigma(K)$ as the space of functions in $H^sigma(K)$ with zero tangent of
an appropriate order depending on $sigma$. Last, we extend $H^sigma(K)$ to
$sigmainmathbb{R}$, and obtain various interpolation theorems with
$sigmainmathbb{R}^+$ or $sigmainmathbb{R}$. We illustrate that there is a
countable set of critical orders, that arises naturally in the boundary
behavior of functions, such that $H^sigma_0(K)$ presents a critical phenomenon
if $sigma$ is critical. These orders will play a crucial role in our study.
They are just the values in $frac 12+mathbb{Z}_+$ in the classical case, but
are much more complicated in the fractal case. | Source: | arXiv, 2002.5888 | Services: | Forum | Review | PDF | Favorites |
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