Liouville type theorems and regularity of solutions to degenerate or singular problems part I: even solutions

Y Sire, S Terracini, S Vita - Communications in Partial Differential …, 2021 - Taylor & Francis
We consider a class of equations in divergence form with a singular/degenerate weight− div
(| y| a A (x, y)∇ u)=| y| af (x, y) or div (| y| a F (x, y)). Under suitable regularity assumptions for …

Uniform bounds for strongly competing systems: the optimal Lipschitz case

N Soave, A Zilio - Archive for Rational Mechanics and Analysis, 2015 - Springer
For a class of systems of semi-linear elliptic equations, including-Δ u_i= f_i (x, u_i)-β u_i j ≠ i
a_ ij u_j^ p,\quad i= 1,\dots, k,-Δ ui= fi (x, ui)-β ui∑ j≠ iaijujp, i= 1,⋯, k, for p= 2 (variational …

Uniform H\" older regularity with small exponent in competition-fractional diffusion systems

S Terracini, G Verzini, A Zilio - arXiv preprint arXiv:1303.6079, 2013 - arxiv.org
For a class of competition-diffusion nonlinear systems involving fractional powers of the
Laplacian, including as a special case the fractional Gross-Pitaevskii system, we prove that …

A geometric inequality and a symmetry result for elliptic systems involving the fractional Laplacian

S Dipierro, A Pinamonti - Journal of Differential Equations, 2013 - Elsevier
We study the symmetry properties for solutions of elliptic systems of the type where F∈
Cloc1, 1 (R2), s1, s2∈(0, 1) and the operator (− Δ) s is the so-called fractional Laplacian. We …

On s-harmonic functions on cones

S Terracini, G Tortone, S Vita - Analysis & PDE, 2018 - msp.org
On s-harmonic functions on cones Page 1 ANALYSIS & PDE msp Volume 11 No. 7 2018
SUSANNA TERRACINI, GIORGIO TORTONE AND STEFANO VITA ON s-HARMONIC …

A Liouville type theorem for Lane–Emden systems involving the fractional Laplacian

A Quaas, A Xia - Nonlinearity, 2016 - iopscience.iop.org
We establish a Liouville type theorem for the fractional Lane–Emden system:{(− Δ) αu= vqin
RN,(− Δ) αv= upin RN, where $\alpha\in (0, 1) $, $ N> 2\alpha $ and p, q are positive real …

Concentration phenomena for critical fractional Schr\" odinger systems

V Ambrosio - arXiv preprint arXiv:1704.04391, 2017 - arxiv.org
In this paper we study the existence, multiplicity and concentration behavior of solutions for
the following critical fractional Schr\" odinger system\begin {equation*}\left\{\begin …

On the nodal set of solutions to degenerate or singular elliptic equations with an application to s-harmonic functions

Y Sire, S Terracini, G Tortone - Journal de Mathématiques Pures et …, 2020 - Elsevier
This work is devoted to the geometric-theoretic analysis of the nodal set of solutions to
degenerate or singular equations involving a class of operators including L a= div (| y| a∇) …

Hölder bounds and regularity of emerging free boundaries for strongly competing Schrödinger equations with nontrivial grouping

N Soave, H Tavares, S Terracini, A Zilio - Nonlinear Analysis, 2016 - Elsevier
We study interior regularity issues for systems of elliptic equations of the type− Δ ui= fi, β (x)−
β∑ j≠ iaijui| ui| p− 1| uj| p+ 1 set in domains Ω⊂ RN, for N⩾ 1. The paper is devoted to the …

On isolated singularities of fractional semi-linear elliptic equations

H Yang, W Zou - Annales de l'Institut Henri Poincaré C, Analyse non …, 2021 - Elsevier
In this paper, we study the local behavior of nonnegative solutions of fractional semi-linear
equations (− Δ) σ u= up with an isolated singularity, where σ∈(0, 1) and nn− 2 σ< p< n+ 2 σ …