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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

2 votes
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176 views

Elliptic regularity of second order pseudos

Let $M$ be a compact manifold. Choose a point $q \in M$. Let $P$ be a second order positive self-adjoint pseudodifferential operator such that $\text{Spec}(P) \subset (0, \infty)$. Also, we know that …