Graduate Analysis Seminar

Trevor Leslie
The Aubin-Lions-Simon Compactness Theorem
Abstract: The Aubin-Lions Theorem, proved in the 1960s, is a useful tool for extracting subsequences (of Banach space-valued functions) which converge in some sense. For example, it is a key step in one of the standard proofs of the existence of weak solutions to the classical Navier-Stokes Equations, namely showing that a subsequence of the relevant Galerkin approximations converges to a solution. Later, Simon removed the hypothesis that the underlying Banach spaces must be reflexive. The resulting theorem is consequently sometimes called the Aubin-Lions-Simon Theorem. In this talk, we state and prove the Aubin-Lions-Simon Theorem. If time allows, we will give an application that requires Simon's version of the Theorem.
Wednesday November 29, 2017 at 4:00 PM in SEO 512
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