Here is where I will be posting any supplemental notes or resources.
Notes to accompany the lectures on Weyl’s law for domains in R^n
Brooks: The Sunada Method
Buser, Conway and Doyle: Some planar isospectral domains
Gordon and Webb: You can’t hear the shape of a drum
Chapman: Drums that sound the same
Dirac operators and index theory
Outline of the proof of the index theorem for Dirac operators