A priori bounds for solutions to fully anisotropic elliptic equations
We are concerned with a priori estimates, in rearrangement form, for weak solutions to fully anisotropic, nonlinear elliptic equations with lower-order terms whose prototype
is
\begin{equation*}
\left\{
\begin{array}
[c]{lll} -\hbox{\rm div} \; (a(x, u, \nabla u)) + b(u)=f(x) &
\qquad\hbox{\rm in\ } \Omega
\\
u=0 & \qquad\text{on}\;\partial\Omega.
\end{array}
\right.
\end{equation*}
Here, $\Omega$ is an open bounded set in $\mathbb{R}^{N}$, with $N\geq2$, $a(x, \eta, \xi)$ is a Carath\'{e}odory function fulfilling
\begin{equation*}
a(x,\eta,\xi)\cdot\xi\geq\Phi\left( \xi\right) \qq