## Topological Methods in Nonlinear Analysis

### The jumping nonlinearity problem revisited: an abstract approach

#### Abstract

We consider a class of nonlinear problems of the form $$Lu+g(x,u)=f,$$ where $L$ is an unbounded self-adjoint operator on a Hilbert space $H$ of $L^{2}(\Omega)$-functions, $\Omega\subset\mathbb{R}^{N}$ an arbitrary domain, and $g\colon \Omega\times\mathbb{R}\rightarrow\mathbb{R}$ is a "jumping nonlinearity" in the sense that the limits $$\lim_{s\rightarrow-\infty} \frac{g(x,s)}{s}=a \quad\text{and}\quad \lim_{s\rightarrow\infty}\frac{g(x,s)}{s}=b$$ exist and "jump" over an eigenvalue of the operator $-L$. Under rather general conditions on the operator $L$ and for suitable $a< b$, we show that a solution to our problem exists for any $f\in H$. Applications are given to the beam equation, the wave equation, and elliptic equations in the whole space $\mathbb{R}^{N}$.

#### Article information

Source
Topol. Methods Nonlinear Anal., Volume 21, Number 2 (2003), 249-272.

Dates
First available in Project Euclid: 30 September 2016

https://projecteuclid.org/euclid.tmna/1475266298

Mathematical Reviews number (MathSciNet)
MR1998429

Zentralblatt MATH identifier
1112.35006

#### Citation

Costa, David G.; Tehrani, Hossein. The jumping nonlinearity problem revisited: an abstract approach. Topol. Methods Nonlinear Anal. 21 (2003), no. 2, 249--272. https://projecteuclid.org/euclid.tmna/1475266298

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