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Existence results for quasimonotone semilinear coupled elliptic systems via sub-supersolution method

Shalmali Bandyopadhyay, Briceyda B. Delgado, Nsoki Mavinga, Maria Amarakristi Onydio

Abstract

We establish the existence of weak solutions of coupled systems of elliptic partial differential equations with quasimonotone nonlinearities in the domain interior and on the boundary. When the nonlinearities satisfy some monotonicity conditions, we employ monotone iteration techniques to establish the existence of minimal and maximal weak solutions between an ordered pair of sub- and supersolution. In the absence of monotonicity, we prove an existence result when the nonlinearities satisfy certain growth conditions. In addition, we provide concrete examples that illustrate the applicability of our theoretical results.

Existence results for quasimonotone semilinear coupled elliptic systems via sub-supersolution method

Abstract

We establish the existence of weak solutions of coupled systems of elliptic partial differential equations with quasimonotone nonlinearities in the domain interior and on the boundary. When the nonlinearities satisfy some monotonicity conditions, we employ monotone iteration techniques to establish the existence of minimal and maximal weak solutions between an ordered pair of sub- and supersolution. In the absence of monotonicity, we prove an existence result when the nonlinearities satisfy certain growth conditions. In addition, we provide concrete examples that illustrate the applicability of our theoretical results.

Paper Structure

This paper contains 5 sections, 11 theorems, 122 equations.

Table of Contents

  1. Introduction
  2. Preliminaries
  3. Proof of Theorem \ref{['th:monotone']}
  4. Proof of Theorem \ref{['nonmonotone']}
  5. Example

Key Result

Theorem 1.1

Suppose there exists a weak subsolution $(\underline{u}_1, \underline{u}_2)$ and supersolution $(\overline{u}_1, \overline{u}_2)$ of pde:system:each with $(\underline{u}_1, \underline{u}_2) \le (\overline{u}_1, \overline{u}_2)$ and the functions $f_i, g_i$ ($i=1,2$) satisfy the following monotonicit then system pde:system:each has a minimal weak solution $(u_{1,*}, u_{2,*})$ and a maximal weak sol

Theorems & Definitions (20)

  • Theorem 1.1
  • Theorem 1.2
  • Lemma 2.1
  • proof
  • Proposition 2.1
  • proof
  • Proposition 2.2
  • proof
  • Corollary 2.3
  • proof
  • ...and 10 more