Karl K. Brustad
The explicit solution to the Dirichlet problem for a class of mean value equations on the real line is derived. It shed some light on the behavior of solutions to general nonlocal elliptic equations.
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In this paper, we study properties of solutions of the Dominative $p$-Laplace equation with homogeneous Dirichlet boundary conditions in a bounded convex domain $Ω$. For the equation $-\mathcal{D}_p u= 1$, we show that $\sqrt{u}$ is concave, and for the eigenvalue problem $\mathcal{D}_p u + λu=0$, we show that $\log {u}$ is concave.
We show that value functions of a certain time-dependent control problem in $Ω\times (0,T)$, with a continuous payoff $F$ on the parabolic boundary, converge uniformly to the viscosity solution of the parabolic dominative $p$-Laplace equation $$2(n+p)u_t=Δu+(p-2)λ_n(D^2 u),$$ with the boundary data $F$. Here $2\leq p< \infty$, and $λ_n(D^2 u)$ is the largest eigenvalue of the Hessian $D^2 u$.
The Dominative $p$-Laplacian is the operator defined for $2\le p < \infty$ as follows: \begin{equation}\label{dominativep} \mathcal{L}_{p}u(x)=\frac{1}{p}\left(λ_{1}+\ldots+λ_{N-1}\right)+\frac{(p-1)}{p}λ_{N}, \end{equation} where we have ordered the eigenvalues of $D^{2}u(x)$ as $λ_{1}\le λ_{2}\ldots\leλ_{N}$. The operator $\mathcal{L}_{p}u(x)$ was introduced by Brustand to give a natural explanation of the superposition principle for the $p$-Laplace equation. In this paper, we present a discrete stochastic approximation to the unique viscosity solution of the Dirichlet problem for the Domina…
The Dominative $p$-Laplace Operator is introduced. This operator is a relative to the $p$-Laplacian, but with the distinguishing property of being sublinear. It explains the superposition principle in the $p$-Laplace Equation.
We investigate the mixed local and nonlocal parabolic $p$-Laplace equation \begin{align*} \partial_t u(x,t)-Δ_p u(x,t)+\mathcal{L}u(x,t)=0, \end{align*} where $Δ_p$ is the local $p$-Laplace operator and $\mathcal{L}$ is the nonlocal $p$-Laplace operator. Based on the combination of suitable Caccioppoli-type inequality and Logarithmic Lemma with a De Giorgi-Nash-Moser iteration, we establish the local boundedness and Hölder continuity of weak solutions for such equations.
We give a unified proof of Hölder regularity of weak solutions for mixed local and nonlocal $p$-Laplace type parabolic equations with the full range of exponents $1<p<\infty$. Our proof is based on the expansion of positivity together with the energy estimate and De Giorgi type lemma.
Optimal in tail Hölder estimates for weak solutions of the nonlocal parabolic p-Laplace equations on the Heisenberg group
本文研究了海森堡群上非局部抛物p-拉普拉斯方程弱解的最优尾Hölder估计问题，通过引入最优尾条件证明了弱解的Hölder连续性。
On the kinetic $p$-Laplace equation with nonlocal diffusion
本文研究了动能 $p$-拉普拉斯方程的两种非局部版本：一种通过差分定义的加利多型模型，另一种通过傅里叶乘法定义的贝塞尔型模型。利用临界动能轨迹，推导出适应于动能输运-扩散几何的表示公式，并建立非局部扩散的齐次和标度不变的动能加利多-尼伦伯格不等式，从而为非局部扩散的动能 $p$-拉普拉斯方程的弱解获得积分性提升估计。
Weak Harnack estimates for a doubly nonlinear nonlocal p-Laplace equation
针对双重非线性非局部p-Laplace方程的弱上解，建立了带最优抛物尾的新型弱Harnack估计，利用正性扩张和测度理论，仅需局部正性，凸显非局部特征。
We establish a local boundedness estimate for weak subsolutions to a doubly nonlinear parabolic fractional $p$-Laplace equation. Our argument relies on energy estimates and a parabolic nonlocal version of De Giorgi's method. Furthermore, by means of a new algebraic inequality, we show that positive weak supersolutions satisfy a reverse Hölder inequality. Finally, we also prove a logarithmic decay estimate for positive supersolutions.
We establish existence results for a class of mixed anisotropic and nonlocal $p$-Laplace equation with singular nonlinearities. We consider both constant and variable singular exponents. Our argument is based on an approximation method. To this end, we also discuss the necessary regularity properties of weak solutions of the associated non-singular problems. More precisely, we obtain local boundedness of subsolutions, Harnack inequality for solutions and weak Harnack inequality for supersolutions.
Mixed local-nonlocal $p$-Laplace equation with variable singular nonlinearity in the Heisenberg group
本文研究了海森堡群中混合局部-非局部 $p$-拉普拉斯方程的弱解存在性、唯一性和正则性，首次在非交换设定中处理此类问题。
Sobolev regularity for the nonlocal $(1, p)$-Laplace equations in the superquadratic case
本文研究超二次情形下非局部$(1, p)$-Laplace方程弱解的内部Sobolev正则性，通过分析结构特征并结合有限差商法、尾部估计与Moser型迭代等技术，导出了弱解的显式Hölder连续性估计。
We discuss pointwise behavior of weak supersolutions for a class of doubly nonlinear parabolic fractional $p$-Laplace equations which includes the fractional parabolic $p$-Laplace equation and the fractional porous medium equation. More precisely, we show that weak supersolutions have lower semicontinuous representative. We also prove that the semicontinuous representative at an instant of time is determined by the values at previous times. This gives a pointwise interpretation for a weak supersolution at every point. The corresponding results hold true also for weak subsolutions. Our results …
Equivalence of weak and viscosity solutions for nonlocal p-Laplace type equations on the Heisenberg group
研究海森堡群上一类非局部p-拉普拉斯型方程弱解与粘性解的等价性，核心方法是修正下卷积的内在逼近、海森堡平滑化及适应次黎曼几何的非局部分部积分论证，克服了海森堡群非交换结构带来的困难。
In this article, we consider mixed local and nonlocal Sobolev $(q,p)$-inequalities with extremal in the case $0<q<1<p<\infty$. We prove that the extremal of such inequalities is unique up to a multiplicative constant that is associated with a singular elliptic problem involving the mixed local and nonlocal $p$-Laplace operator. Moreover, it is proved that the mixed Sobolev inequalities are necessary and sufficient condition for the existence of weak solutions of such singular problems. As a consequence, a relation between the singular $p$-Laplace and mixed local and nonlocal $p$-Laplace equati…
Local Hölder regularity for nonlocal parabolic $p$-Laplace equations
本文针对一类非局部抛物型 $p$-Laplace 方程，在 $p\in (1,\infty)$ 且 $s \in (0,1)$ 的条件下，证明了其解具有局部 Hölder 正则性。
We give an alternative proof for Hölder regularity for weak solutions of nonlocal elliptic quasilinear equations modelled on the fractional p-Laplacian where we replace the discrete De Giorgi iteration on a sequence of concentric balls by a continuous iteration. This work can be viewed as the nonlocal counterpart to the ideas developed by Tiziano Granucci.
Pohozaev-type identities for classes of quasilinear elliptic local and nonlocal equations and systems, with applications
该研究为含局部与非局部 $p$-Laplace 算子的拟线性椭圆方程及方程组建立 Pohozaev 型恒等式，涵盖各向异性、分数阶及混合情形，并推广至方程组且给出应用。
On sign-changing solutions for mixed local and nonlocal $p$-Laplace operator
本文利用下降流不变集、Nehari 流形与 Brouwer 度理论，证明混合局部与非局部 $p$-Laplace 椭圆问题存在多个变号解及最低能量变号解，并给出其能量严格大于两倍基态能量。
Eigenvalues of nonlinear $(p,q)$-fractional Laplace operators under nonlocal Neumann conditions
研究非局部 $(p,q)$-分数阶 Laplace 算子在齐次非局部 Neumann 条件下的特征值问题，完整刻画其谱集并证明特征函数全局有界。
Two alternative proofs of weak Harnack inequality for mixed local and nonlocal $p$-Laplace equations with a nonhomogeneity
本文研究了一类混合局部和非局部 $p$-拉普拉斯方程，给出了保证变号超解弱赫尔曼不等式尾项的 $f $ 的充分条件，采用两种不同方法避免了克里洛夫-萨夫诺夫覆盖引理和正性展开，一种通过约翰-尼伦伯格引理，另一种通过Bombieri-Giusti引理，并为超解的反向霍尔德不等式提供了新证明，同时通过局部有界性结果、尾估计和初始弱赫尔曼不等式建立了解的赫尔曼不等式。
Bifurcation results and multiple solutions for the fractional $(p,q)$-Laplace operators
本文研究带 Dirichlet 边界条件的分数阶 $(p,q)$-Laplace 算子之和所对应的非线性非局部特征值问题，证明了从平凡解及无穷远处的分岔结果，并利用变分方法获得多解存在性。
We prove some basic inequalities relating the Gagliardo-Nirenberg seminorms of a symmetric function $u$ on $\mathbb R^n$ and of its perturbation $uφ_μ$, where $φ_μ$ is a suitably chosen eigenfunction of the Laplace-Beltrami operator on the sphere $\mathbb S^{n-1}$, thus providing a technical but rather powerful tool to detect symmetry breaking and multiplicity phenomena in variational equations driven by the fractional Laplace operator. A concrete application to a problem related to the fractional Caffarelli-Kohn-Nirenberg inequality is given.
We introduce a new class of quasilinear nonlocal operators and study equations involving these operators. The operators are degenerate elliptic and may have arbitrary growth in the gradient. Included are new nonlocal versions of p-Laplace, $\infty$-Laplace, mean curvature of graph, and even strongly degenerate operators, in addition to some nonlocal quasilinear operators appearing in the existing literature. Our main results are comparison, uniqueness, and existence results for viscosity solutions of linear and fully nonlinear equations involving these operators. Because of the structure of ou…
Regularity theory for nonlocal equations with general growth in the Heisenberg group
本文在海森堡群中研究非局部 $G$-Laplace 方程，利用改进的非局部 Caccioppoli 型估计，以 De Giorgi-Nash-Moser 理论统一证明了弱解的有界性、Hölder 连续性与 Harnack 不等式。
Ergodicity for local and nonlocal stochastic singular $p$-Laplace equations is proven, without restriction on the spatial dimension and for all $p\in[1,2)$. This generalizes previous results from [Gess, Tölle; J. Math. Pures Appl., 2014], [Liu, Tölle; Electron. Commun. Probab., 2011], [Liu; J. Evol. Equations, 2009]. In particular, the results include the multivalued case of the stochastic (nonlocal) total variation flow, which solves an open problem raised in [Barbu, Da Prato, Röckner; SIAM J. Math. Anal., 2009]. Moreover, under appropriate rescaling, the convergence of the unique invariant m…
Some qualitative and quantitative properties of weak solutions to mixed anisotropic and nonlocal quasilinear elliptic and doubly nonlinear parabolic equations
本文研究混合各向异性与非局部p-Laplace算子及双重非线性抛物方程，建立存在唯一性、比较定理、Hardy不等式及正则性估计，并利用Picone恒等式与能量估计等方法。
Regularity of Solutions for the Nonlocal Wave Equation on Periodic Distributions
本文利用傅里叶乘子方法研究周期分布上非局部波动方程解的正则性，覆盖正则解与分布解、可积核与奇异核，并证明解在非局部性消失或核奇异性趋于临界值时收敛到经典波动方程的解。
This work addresses the regularity of solutions for a nonlocal diffusion equation over the space of periodic distributions. The spatial operator for the nonlocal diffusion equation is given by a nonlocal Laplace operator with a compactly supported integral kernel. We follow a unified approach based on the Fourier multipliers of the nonlocal Laplace operator, which allows the study of regular as well as distributional solutions of the nonlocal diffusion equation, integrable as well as singular kernels, in any spatial dimension. In addition, the results extend beyond operators with singular kern…
We formulate and study the nonlocal and local least gradient problem, which is the Dirichlet problem for the 1-Laplace operator, in a quite natural setting of Carnot groups. We study the passage from the nonlocal problem to the local problem as the range of the interaction goes to zero; to do this, we first prove a total variation estimate of independent interest.
The three concepts of exact, null and approximate controllabilities are analyzed from the exterior of the Moore--Gibson--Thompson equation associated with the fractional Laplace operator subject to the nonhomogeneous Dirichlet type exterior condition.
We develop an existence, regularity and potential theory for nonlinear integrodifferential equations involving measure data. The nonlocal elliptic operators considered are possibly degenerate and cover the case of the fractional $p$-Laplacean operator with measurable coefficients. We introduce a natural function class where we solve the Dirichlet problem, and prove basic and optimal nonlinear Wolff potential estimates for solutions. These are the exact analogs of the results valid in the case of local quasilinear degenerate equations established by Boccardo & Gallouët \cite{BG1, BG2} and Kilpe…
A non-homogeneous mixed local and nonlocal problem in divergence form is investigated for the validity of the global Calderón-Zygmund estimate for the weak solution to the Dirichlet problem of a nonlinear elliptic equation. We establish an optimal Calderón-Zygmund theory by finding not only a minimal regularity requirement on the mixed local and nonlocal operators but also a lower level of geometric assumption on the boundary of the domain for the global gradient estimate. More precisely, assuming that the nonlinearity of the local operator, whose prototype is the classical $(-Δ_p)^1$-Laplace …
We consider nonlinear nonlocal diffusive evolution equations, governed by fractional Laplace-type operators, fractional time derivative and involving porous medium type nonlinearities. Existence and uniqueness of weak solutions are established using approximating solutions and the theory of maximal monotone operators. Using the De Giorgi-Nash-Moser technique, we prove that the solutions are bounded and Hölder continuous for all positive time.
Hölder regularity for the parabolic perturbed fractional 1-Laplace equations
本文研究了一类抛物型扰动分数1-拉普拉斯方程弱解的正则性，结合差分商、能量估计和迭代方法，通过分解非局部积分处理其贡献，证明弱解在抛物域内局部Hölder连续，建立Sobolev正则性以推导Hölder连续性。
A supercritical nonlocal Neumann problem involving non-homogeneous fractional Laplacian
研究外部Neumann条件下分数阶g-Laplace算子支配的非局部非标准增长问题，利用分数阶Orlicz-Sobolev空间性质与非光滑泛函变分原理，证明正非减径向解的存在性。
In this paper, we study different notions of solutions of nonlocal and nonlinear equations of fractional $p$-Laplace type $${\rm P.V.} \int_{\mathbb R^n}\frac{|u(x)-u(y)|^{p-2}(u(x)-u(y))}{|x-y|^{n+sp}}\,dy = 0.$$ Solutions are defined via integration by parts with test functions, as viscosity solutions or via comparison. Our main result states that for bounded solutions, the three different notions coincide.
This is a follow-up of a paper by Fernández-Bonder-Ritorto-Salort [8], where the classical concept of $H$-convergence was extended to fractional \(p\)-Laplace type operators. In this short paper we provide an explicit characterization of this notion by demonstrating that the weak-* convergence of the coefficients is an equivalent condition for $H$-convergence of the sequence of nonlocal operators. This result takes advantage of nonlocality and is in stark contrast to the local p-Laplacian case
Higher Sobolev regularity for mixed local and nonlocal equations with nonstandard growth
本研究针对可模拟两类随机过程叠加的混合局部与非局部(p,q)-Laplace方程，开展其弱解内部Sobolev正则性的系统研究。
Liouville theorem for singular solutions to nonlocal equations
研究分数阶 Laplace 方程及一般非局部线性方程的奇异解，通过构造基本解和建立局部化比较原理，证明了 Bôcher 型结果与 Liouville 定理。
In this paper we consider a non-local problem for a Laplace operator in a multidimensional bounded symmetric domain. The investigated problem is an analogue of the classical periodic boundary value problems in the case of non-rectangular domain. We prove self-adjointness of the problem and show a method of constructing eigenfunctions. We obtain an analogue of the Rayleigh type inequality and some spectral inequalities for the first eigenvalue of the nonlocal problem.
The fractional heat operator $(\partial_t-Δ_x)^s$ and Continuous Time Random Walks (CTRWs) are interesting and sophisticated mathematical models that can describe complex anomalous systems. In this paper, we prove asymptotic mean value representation formulas for functions with respect to $(\partial_t-Δ_x)^s$ and we introduce new nonlocal, nonlinear parabolic operators related to a tug-of-war which accounts for waiting times and space-time couplings. These nonlocal, nonlinear parabolic operators and equations can be seen as nonlocal versions of the evolutionary infinity Laplace operator.
In this article, we consider the spectral problem for the mixed local and nonlocal $p$-Laplace operator. We discuss the existence and regularity of eigenfunction of the associated Dirichlet $(p,q)$-eigenvalue problem in a bounded domain $Ω\subset\mathbb{R}^N$ under the assumption that $1<p<\infty$ and $1<q<p^{*}$ where $p^{*}=\frac{N p}{N-p}$ if $1<p<N$ and $p^{*}=\infty$ if $p\geq N$.
We consider mixed local and nonlocal quasilinear parabolic equations of $p$-Laplace type and discuss several regularity properties of weak solutions for such equations. More precisely, we establish local boundeness of weak subsolutions, lower semicontinuity of weak supersolutions as well as upper semicontinuity of weak subsolutions. We also discuss the pointwise behavior of the semicontinuous representatives. Our main results are valid for sign changing solutions. Our approach is purely analytic and is based on energy estimates and the De Giorgi theory.
On a class of mixed local and nonlocal semilinear elliptic equation with singular nonlinearity
该研究利用变分法与逼近方法，考察兼具局部与非局部 Laplace 算子的奇异半线性椭圆方程，证明参数依赖情形下弱解存在及扰动情形下多解存在。
In this paper we deal with the stability of solutions of fractional $p-$Laplace problems with nonlinear sources when the fractional parameter $s$ goes to 1. We prove a general convergence result for general weak solutions which is applied to study the convergence of ground state solutions of $p-$fractional problems in bounded and unbounded domains as $s$ goes to 1. Moreover, our result applies to treat the stability of $p-$fractional eigenvalues as $s$ goes to 1.
Harnack Inequality for Parabolic Fractional $p$-Laplace Equations
本文为抛物型分数阶 p-Laplace 方程建立了带最优尾项的内在 Harnack 不等式，采用非局部比较与障碍方法，并得到无需时间间隙的更强结论，结果在线性情形亦为新。
We consider equations involving a combination of local and nonlocal degenerate $p$-Laplace operators. The main contribution of the paper is almost Lipschitz regularity for the homogeneous equation and Hölder continuity with an explicit Hölder exponent in the general case. For certain parameters, our results also imply Hölder continuity of the gradient. In addition, we establish existence, uniqueness and local boundedness. The approach is based on an iteration in the spirit of Moser combined with an approximation method.
We analyze the interior controllability problem for a nonlocal Schrödinger equation involving the fractional Laplace operator $(-Δ)^s$, $s\in(0,1)$, on a bounded $C^{1,1}$ domain $Ω\subset\mathbb{R}^n$. The controllability from a neighborhood of the boundary of the domain is obtained for exponents $s$ in the interval $[1/2,1)$, while for $s<1/2$ the equation is shown to be not controllable. The results follow applying the multiplier method, joint with a Pohozaev-type identity for the fractional Laplacian, and from an explicit computation of the spectrum of the operator in the one-dimensional c…
Gradient Flow Solutions For Porous Medium Equations with Nonlocal Lévy-type Pressure
本文研究了压力由非局部Lévy算子给出的多孔介质型方程，通过变分极小化运动格式构造弱解，克服了因缺乏插值技术带来的挑战。
On mixed local-nonlocal Sobolev-type inequalities and their connection with singular equations in the Heisenberg group
本文在Heisenberg群中建立混合局部-非局部Sobolev型不等式，证明其与奇异p-Laplace方程的解关系，并提供了一种统一框架，连接不同情形下奇异方程的存在理论。
We consider a combination of local and nonlocal $p$-Laplace equations and discuss several regularity properties of weak solutions. More precisely, we establish local boundedness of weak subsolutions, local Hölder continuity of weak solutions, Harnack inequality for weak solutions and weak Harnack inequality for weak supersolutions. We also discuss lower semicontinuity of weak supersolutions as well as upper semicontinuity of weak subsolutions. Our approach is purely analytic and it is based on the De Giorgi-Nash-Moser theory, the expansion of positivity and estimates involving a tail term. The…
We consider the fractional Laplace framework and provide models and theorems related to nonlocal diffusion phenomena. Some applications are presented, including: a simple probabilistic interpretation, water waves, crystal dislocations, nonlocal phase transitions, nonlocal minimal surfaces and Schrödinger equations. Furthermore, an example of an $s$-harmonic function, the harmonic extension and some insight on a fractional version of a classical conjecture formulated by De Giorgi are presented. Although this book aims at gathering some introductory material on the applications of the fractional…
Nonlinear nonlocal equations in Reifenberg flat domains
本文研究 Reifenberg 平坦区域上非齐次分数阶 p-Laplace 方程，在超出 Lipschitz 范畴的非光滑有界域中建立了解及其梯度的精细边界正则性，且结果在线性情形下亦属首次。
Fourier multiplier analysis is developed for nonlocal peridynamic-type Laplace operators, which are defined for scalar fields in $\mathbb{R}^n$. The Fourier multipliers are given through an integral representation. We show that the integral representation of the Fourier multipliers is recognized explicitly through a unified and general formula in terms of the hypergeometric function $_2F_3$ in any spatial dimension $n$. Asymptotic analysis of $_2F_3$ is utilized to identify the asymptotic behavior of the Fourier multipliers $m(ν)$ as $\|ν\|\rightarrow \infty$. We show that the multipliers are …
Lipschitz regularity for parabolic fractional $p$-Laplace equations
研究抛物分数 $p$-拉普拉斯方程局部弱解的空间局部利普希茨连续性，证明在 $sp > p-1$ 时的均匀时间正则性，适用于对称、平移不变核，包括可能不连续的核。
Nonlocal problems for Laplace equation in Bochner spaces
研究无界矩形区域上具有非局部边界条件的拉普拉斯方程，在 Bochner-Sobolev 空间中采用广义谱方法求解，并证明非局部谱问题的根函数系构成张量积基。
Mean value formulas are of great importance in the theory of partial differential equations: many very useful results are drawn, for instance, from the well known equivalence between harmonic functions and mean value properties. In the nonlocal setting of fractional harmonic functions, such an equivalence still holds, and many applications are now-days available. The nonlinear case, corresponding to the $p$-Laplace operator, has also been recently investigated, whereas the validity of a nonlocal, nonlinear, counterpart remains an open problem. In this paper, we propose a formula for the \emph{…
Sobolev regularity for the perturbed fractional 1-Laplace equations in the subquadratic case
本文研究次二次情形下扰动分数1-Laplace方程解的Sobolev正则性，通过阈值划分参数范围，利用非局部有限差分商和Moser迭代，建立了与超二次情形类似的正则性结果。
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