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On-line lectures and texts:
Lectures on spectral theory on combinatorial and quantum graphs,
video (Skip first 5 minutes of
video, part 1,
video, part 2 (with lack of sound),
Formal write-up of the lectures, to be published in a volume of the
Société Mathématique de France.
Linear Methods of Applied Mathematics: Orthogonal series, boundary-value
problems, and integral operators
Classnotes on dynamical systems,
by Evans Harrell.
A short history
of operator theory.