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Stability properties for quasilinear parabolic equations with measure data and applications

Let $Ω$ be a bounded domain of $\mathbb{R}^{N}$, and $Q=Ω\times(0,T).$ We first study the problem \[ \left\{ \begin{array} [c]{l}% {u_{t}}-{Δ_{p}}u=μ\qquad\text{in }Q,\\ {u}=0\qquad\text{on }\partialΩ\times(0,T),\\ u(0)=u_{0}\qquad\text{in }Ω, \end{array} \right. \] where $p>1$, $μ\in\mathcal{M}_{b}(Ω)$ and $u_{0}\in L^{1}(Ω).$ Our main result is a \textit{stability theorem }extending the results of Dal Maso, Murat, Orsina, Prignet, for the elliptic case\textit{. } As an application, we consider the perturbed problem\textit{ } \[ \left\{ \begin{array} [c]{l}% {u_{t}}-{Δ_{p}}u+\mathcal{G}(u)=μ\qquad\text{in }Q,\\ {u}=0\qquad\text{on }\partialΩ\times(0,T),\\ u(0)=u_{0}\qquad\text{in }Ω, \end{array} \right. \] where $\mathcal{G}(u)$ may be an absorption or a source term$.$ In the model case $\mathcal{G}(u)=\pm\left\vert u\right\vert ^{q-1}u$ $(q>p-1),$ or $\mathcal{G}$ has an exponential type. We give existence results when $q$ is subcritical, or when the measure $μ$ is good in time and satisfies suitable capacity conditions.