Spectral Theory

[Spectral Theory in Riemannian Geometry]   by Olivier Lablee

Introduction to Spectral Geometry
Detailed introduction to abstract spectral theory
The Laplacian on a compact Riemannian manifold
Spetrum of the Laplacian on a compact manifold   [Eigenvalues]  [Calculation of the Spetrum] [Eigen value for a Schrodinger operator]
Direct problems in spectral geometry
Inverse problems in spectral geometry   Can one hear the shape of a drum