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Transition semigroups corresponding to Lipschitz dissipative systems
Positivity for large time of solutions of the heat equation: the parabolic antimaximum principle
| 1. | Dpto. Matemática Aplicada, Univ. Complutense, 28040 Madrid, Spain |
| 2. | CEREMATH – UMR MIP, Université Toulouse 1, Place A.France, F–31042 Toulouse Cedex, France |
$\mathcal Q_a(f,u^0)\qquad$ $\partial_tu-\Delta u=au+f(t,x),$ in $Q=]0,\infty [ \times \Omega, $
$u(t,x)=0\qquad$ $(t,x)\in ]0,\infty [ \times \partial \Omega,$
$u(0,x)=u^0(x), \qquad x\in \Omega,$
where $\Omega$ is a smooth bounded domain in $\mathbb R^N$ and $a\in\mathbb R$. We obtain some sufficient conditions for having a finite time $t_p>0$ (depending on $a$ and on the data $u^0$ and $f$ which are not necessarily of the same sign) such that $ u(t,x)>0 \forall t>t_p, a. e. x\in\Omega$.
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