In the previous chapter we have addressed the issue of the convergence of problems set in cylinders becoming large in some directions and for data independent of these directions. To be independent of one direction could also be interpreted as to be periodic in this direction for any period. Then the question arises to see if periodic data can force at the limit the solution of a periodic problem to be periodic. This is the kind of issue that we would like to address now.
KeywordsWeak Solution General Theory Periodic Function Closed Subspace Canonical Basis
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