Eigenvalue problems on Riemannian manifolds lie at the heart of modern geometric analysis, bridging the gap between differential geometry and partial differential equations. In this framework, the ...
An Introduction to the Methods of Rayleigh, Ritz, Weinstein, and Aronszajn. By Prof. S. H. Gould. (Mathematical Expositions, No. 10.) Pp. xiv + 179. (Toronto ...