Abstract
In this note we consider a linear parabolic problem defined on a non-cylindrical unbounded domain Q. If Ω t denotes the section of Q above t, the Ω t size goes to +∞, when t → +∞, i.e. the sections Ω t become unbounded in some directions when the time t becomes large. Here a model problem is studied, but the technique used can be applied for a wide class of problems, as nonlinear ones, defined on more general domains Q as those introduced by Lions [11]. An asymptotically exponential convergence of the solutions of such problems towards the solution of an elliptic problem defined on a lower dimensional domain is established.
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