• Remark on an Infinite Semipositone Problem with Indefinite Weight and Falling Zeros

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    • Keywords


      Infinite semipositone problems; indefinite weight; falling zeros; sub-supersolution method.

    • Abstract


      In this work, we consider the positive solutions to the singular problem

      \begin{equation*}\begin{cases}-\Delta u=am(x)u-f(u)-\frac{c}{u^\alpha} & \text{in}\quad\Omega,\\ u=0 & \text{on}\quad\partial\Omega,\end{cases}\end{equation*}

      where $0 < \alpha < 1,a>0$ and $c>0$ are constants, 𝛺 is a bounded domain with smooth boundary $\partial\Omega,\Delta$ is a Laplacian operator, and $f:[0,\infty]\longrightarrow\mathbb{R}$ is a continuous function. The weight functions $m(x)$ satisfies $m(x)\in C(\Omega)$ and $m(x)>m_0>0$ for $x\in\Omega$ and also $\|m\|_\infty=l < \infty$. We assume that there exist $A>0, M>0,p>1$ such that $alu-M\leq f(u)\leq Au^p$ for all $u\in[0,\infty)$. We prove the existence of a positive solution via the method of sub-supersolutions when $m_0 a>\frac{2\lambda_1}{1+\alpha}$ and 𝑐 is small. Here $\lambda_1$ is the first eigenvalue of operator $-\Delta$ with Dirichlet boundary conditions.

    • Author Affiliations


      G A Afrouzi1 S Shakeri1 N T Chung2

      1. Department of Mathematics, Faculty of Mathematical Sciences, University of Mazandaran, Babolsar, Iran
      2. Department of Mathematics and Informatics, Quang Binh University, 312 Ly Thuong Kiet, Dong Hoi, Quang Binh, Vietnam
    • Dates

  • Proceedings – Mathematical Sciences | News

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