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Fractional integration and differentiation of variable order: an overview

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Abstract

We give an overview of a selection of studies on fractional operations of integration and differentiation of variable order, when this order may vary from point to point. We touch on both the Euclidean setting and also the general setting within the framework of quasimetric measure spaces.

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Abbreviations

n :

is the n-dimensional Euclidean space, \(|x|=\sqrt {x_{1}^{2}+\cdots+ x_{n}^{2}}\);

\(\mathbb{S}^{n-1}\) :

is the unit sphere in ℝn centered at the origin, \(|\mathbb{S}^{n-1}|\) is its surface area;

Δ:

is the Laplace operator;

(X,ϱ,μ):

denotes a quasimetric measure space with quasidistance ϱ and measure μ;

δ(x,Ω)=inf yΩ ϱ(x,y):

is the distance of a point xX to a set ΩX.

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Samko, S. Fractional integration and differentiation of variable order: an overview. Nonlinear Dyn 71, 653–662 (2013). https://doi.org/10.1007/s11071-012-0485-0

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