Science Mathematics

Nonlinear Potential Theory on Metric Spaces by Anders Bjorn, Jana Bjorn

By Anders Bjorn, Jana Bjorn

The p-Laplace equation is the most prototype for nonlinear elliptic difficulties and types a foundation for numerous purposes, akin to injection moulding of plastics, nonlinear elasticity thought and photograph processing. Its recommendations, known as p-harmonic services, were studied in a number of contexts because the Nineteen Sixties, first on Euclidean areas and afterward Riemannian manifolds, graphs and Heisenberg teams. Nonlinear strength concept of p-harmonic services on metric areas has been constructing because the Nineteen Nineties and generalizes and unites those previous theories.

This monograph supplies a unified therapy of the topic and covers lots of the on hand ends up in the sphere, to this point scattered over loads of learn papers. the purpose is to serve either as an creation to the realm for an reader and as a reference textual content for an lively researcher. The presentation is very self-contained, however the reader is believed to grasp degree conception and sensible analysis.

The first 1/2 the booklet offers with Sobolev kind areas, so-called Newtonian areas, in keeping with top gradients on common metric areas. within the moment part, those areas are used to check p-harmonic services on metric areas and a nonlinear power idea is constructed less than a few extra, yet ordinary, assumptions at the underlying metric space.

Each bankruptcy comprises ancient notes with suitable references and an in depth index is supplied on the finish of the booklet.

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1. e. 49. Moreover, fj ! , as j ! 1. Finally, if fjk ! , as k ! 49. X / and only concentrate on the convergence of p-weak upper gradients. 4. X / is a p-weak upper gradient of fj , j D 1; 2; ::: . Assume further that fj ! e. and gj ! X /, as j ! e. and that g is nonnegative. Then g is a p-weak upper gradient of f . e. is essential. Proof. 1) that gj ds ! g ds 2 R, as j ! €/ D 0. x/j D 1g. e. e. curve is such that gj is an upper gradient of fj along for all j D 1; 2; ::: , and neither nor any of its subcurves belong to €.

We will need the following simple facts. 58. If u and v are absolutely continuous on Œa; b, then u C v, maxfu; vg and uv are also absolutely continuous on Œa; b. If u W Œa; b ! Œc; d  is absolutely continuous and v W Œc; d  ! R is Lipschitz, then v ı u is also absolutely continuous on Œa; b. 26 1 Newtonian spaces Proof. Let us start with uv: As u and v obviously are continuous they P are bounded on Œa; b, say by M > 0. ai /j iD1 " " CM

Let Á Z €j Ä Z p d D X j D1 Ä sup X j D1 p j p j j. €j / C ": j D1 Letting " ! 0 completes the proof of this part. (c) Let " > 0 and let be a nonnegative Borel function such that Z ds 1 for all 2 € 0 R and such that X p d 0 2 € 0 of . € 0 / C ". €/ Ä R X p 2 €. € 0 / C " ! € 0 /, as " ! 0. 37. Let x 2 X . x; j // for all j D 1; 2; ::: , and such that ds D 1 for all 2 €. 33 for another equivalent condition. Proof. X /. 5 p-weak upper gradients and modulus of curve families (b) ) (c) This is trivial.

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