Calculus of Variations and Geometric Measure Theory
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A. Carbotti - G. E. Comi

A note on Riemann-Liouville fractional Sobolev spaces

created by carbotti on 22 Mar 2020
modified by comi on 31 Mar 2020


Submitted Paper

Inserted: 22 mar 2020
Last Updated: 31 mar 2020

Pages: 40
Year: 2020

ArXiv: 2003.09515 PDF


Taking inspiration from a recent paper by Bergounioux, Leaci, Nardi and Tomarelli, we study the Riemann-Liouville fractional Sobolev space $W^{s, p}_{RL, a+}(I)$, for $I = (a, b)$ for some $a, b \in \mathbb{R}, a < b$, $s \in (0, 1)$ and $p \in [1, \infty]$; that is, the space of functions $u \in L^{p}(I)$ such that the left Riemann-Liouville $(1 - s)$-fractional integral $I_{a+}^{1 - s}[u]$ belongs to $W^{1, p}(I)$. We prove that the space of functions of bounded variation and the fractional Sobolev space, $BV(I)$ and $W^{s, 1}(I)$, continuously embed into $W^{s, 1}_{RL, a+}(I)$. In addition, we define the space of functions with left Riemann-Liouville $s$-fractional bounded variation, $BV^{s}_{RL,a+}(I)$, as the set of functions $u \in L^{1}(I)$ such that $I^{1 - s}_{a+}[u] \in BV(I)$, and we analyze some fine properties of these functions. Finally, we prove some fractional Sobolev-type embedding results and we analyze the case of higher order Riemann-Liouville fractional derivatives.

Keywords: fractional Sobolev spaces, fractional calculus, fractional derivative, Riemann-Liouville fractional integral, Riemann-Liouville fractional derivative, Caputo fractional derivative, fractional $BV$ spaces


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