## Advances in Differential Equations

- Adv. Differential Equations
- Volume 8, Number 11 (2003), 1377-1408.

### Existence and uniqueness for $L^1$ data of some elliptic equations with natural growth

#### Abstract

We deal with the following nonlinear elliptic problem: $$ \begin{cases} - \hbox{div} \ {{\bf a}}( x , u, \nabla u) + b( x , u , \nabla u) = f & \ \hbox{ in } \ \Omega \\ u = 0 & \ \hbox{ on} \ \partial \Omega, \end{cases} $$ where $\Omega$ is a bounded, open set in $\mathbb R^N$, $f \in L^1 ( \Omega )$, $- \hbox{div} \ {{\bf a}}(x, u, \nabla u) $ defines an operator satisfying Leray---Lions-type conditions, and the lower-order term satisfies natural growth conditions and some other properties; we point out that these properties do not include a sign assumption (see in (2) below our model example). We prove existence of an entropy solution for this problem (see Definition 2.2 below), and we show that, under a natural monotonicity hypothesis, there exists a smallest entropy solution.

#### Article information

**Source**

Adv. Differential Equations, Volume 8, Number 11 (2003), 1377-1408.

**Dates**

First available in Project Euclid: 19 December 2012

**Permanent link to this document**

https://projecteuclid.org/euclid.ade/1355926121

**Mathematical Reviews number (MathSciNet)**

MR2016651

**Zentralblatt MATH identifier**

1158.35365

**Subjects**

Primary: 35J60: Nonlinear elliptic equations

Secondary: 35R05: Partial differential equations with discontinuous coefficients or data

#### Citation

Segura de León, Sergio. Existence and uniqueness for $L^1$ data of some elliptic equations with natural growth. Adv. Differential Equations 8 (2003), no. 11, 1377--1408. https://projecteuclid.org/euclid.ade/1355926121