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We first study the linear eigenvalue problem for a planar Dirac system in the open half-line and describe the nodal properties of its solution by means of the rotation number. We then give a global bifurcation result for a planar nonlinear…

Classical Analysis and ODEs · Mathematics 2014-07-01 Anna Capietto , Walter Dambrosio , Duccio Papini

We consider the inverse problem of determining a general semilinear term appearing in nonlinear parabolic equations. For this purpose, we derive a new criterion that allows to prove global recovery of some general class of semilinear terms…

Analysis of PDEs · Mathematics 2020-11-13 Yavar Kian , Gunther Uhlmann

The hierarchy of integrable equations are considered. The dynamical approach to the theory of nonlinear waves is proposed. The special solutions(nonlinear waves) of considered equations are derived. We use powerful methods of computer…

solv-int · Physics 2007-05-23 N. A. Kostov , Z. T. Kostova

This paper introduces a convenient solution space for the uniformly elliptic fully nonlinear path dependent PDEs. It provides a wellposedness result under standard Lipschitz-type assumptions on the nonlinearity and an additional assumption…

Analysis of PDEs · Mathematics 2016-02-12 Zhenjie Ren

In this paper, we prove several Poincar\'e inequalities of fractional type on conformally flat manifolds with finite total Q-curvature. This shows a new aspect of the $Q$-curvature on noncompact complete manifolds.

Differential Geometry · Mathematics 2016-01-05 Yannick Sire , Yi Wang

We present some further results on Liouville type theorems for some conformally invariant fully nonlinear equations.

Analysis of PDEs · Mathematics 2007-05-23 Aobing Li , YanYan Li

Based on the d'Alembert-Lagrange-Poincar\'{e} variational principle, we formulate general equations of motion for mechanical systems subject to nonlinear nonholonomic constraints, that do not involve Lagrangian undetermined multipliers. We…

Mathematical Physics · Physics 2007-09-29 Naseer Ahmed , Muhammad Usman

In this paper, we prove the pointwise boundary differentiability for viscosity solutions of fully nonlinear elliptic equations. This generalizes the previous related results for linear equations. The geometrical conditions in this paper are…

Analysis of PDEs · Mathematics 2021-10-19 Duan Wu , Yuanyuan Lian , Kai Zhang

This article addresses linear hyperbolic partial differential equations with non-smooth coefficients and distributional data. Solutions are studied in the framework of Colombeau algebras of generalized functions. Its aim is to prove upper…

Analysis of PDEs · Mathematics 2015-07-31 Hideo Deguchi , Michael Oberguggenberger

In this short note we are presenting a method of finding particular solutions of nonhomegeneous linear equations. This approach is different from methods of undetermined coefficients or variation of parameters presented in virtually every…

General Mathematics · Mathematics 2025-10-01 Ashot Djrbashian , Milena Safaryan

A subdiffusion problem in which the diffusion term is related to a stable stochastic process is introduced. Linear models of these systems have been studied in a general way, but non-linear models require a more specific analysis. The model…

Probability · Mathematics 2021-11-05 Soveny Solís , Vicente Vergara

In this paper, we investigate the fully nonlinear wave equations on the product space $\mathbb{R}^3\times\mathbb{T}$ with quadratic nonlinearities and on $\mathbb{R}^2\times\mathbb{T}$ with cubic nonlinearities, respectively. It is shown…

Analysis of PDEs · Mathematics 2025-05-16 Fei Hou , Fei Tao , Huicheng Yin

We give evaluations in closed form of certain non linear differential equations

General Mathematics · Mathematics 2014-04-01 Nikos Bagis

We construct solutions of nonlinear reaction-diffusion equations with nonlinear boundary conditions in spaces where the problem is supercritical and show the nonlinear balance required between the nonlinear terms in order to obtain a…

Analysis of PDEs · Mathematics 2012-05-22 Aníbal Rodríguez-Bernal , Alejandro Vidal-López

We present a general method for studying long time asymptotics of nonlinear parabolic partial differential equations. The method does not rely on a priori estimates such as the maximum principle. It applies to systems of coupled equations,…

chao-dyn · Physics 2008-02-03 J. Bricmont , A. Kupiainen , G. Lin

Nonlinear reaction-diffusion systems are known to exhibit very many novel spatiotemporal patterns. Fisher equation is a prototype of diffusive equations. In this contribution we investigate the integrability properties of the generalized…

Exactly Solvable and Integrable Systems · Physics 2007-05-23 P. S. Bindu , M. Lakshmanan

We prove the existence and uniqueness of entropy solutions for nonlinear diffusion equations with nonlinear conservative gradient noise. As particular applications our results include stochastic porous media equations, as well as the…

Probability · Mathematics 2020-06-17 Konstantinos Dareiotis , Benjamin Gess

Applying the method of moving planes in integral forms, we establish radial symmetry for positive solutions to a class of semilinear equations involving the fractional Laplacian in the unit ball and obtain Liouville type theorems concerning…

Analysis of PDEs · Mathematics 2013-10-01 Wenxiong Chen , Yanqin Fang , Ray Yang

This paper is a tutorial that demonstrates various methods from the Colombeau theory of generalized functions in the context of semilinear wave equations. The Colombeau generalized functions constitute differential algebras that contain the…

Analysis of PDEs · Mathematics 2007-05-23 Michael Oberguggenberger

In this paper, we consider a second-order scalar auxiliary variable (SAV) Fourier spectral method to solve the nonlinear fractional generalized wave equation. Unconditional energy conservation or dissipation properties of the fully discrete…

Numerical Analysis · Mathematics 2021-05-06 Nan Wang , Meng Li , Chengming Huang