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Pointwise spatial decay of time-dependent Oseen flows: The case of data with noncompact support

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  • The article deals with the time-dependent Oseen system in a 3D exterior domain. It is shown that the velocity part of a weak solution to that system decays as $\bigl(\, |x| \cdot (1+|x|-x_1) \,\bigr) ^{-1}$, and its spatial gradient as $\bigl(\, |x| \cdot (1+|x|-x_1) \,\bigr) ^{-3/2}$, for $|x|\to \infty $. This result is obtained for data that need not have compact support.
    Mathematics Subject Classification: Primary: 35Q30, 65N30; Secondary: 76D05.


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