The following von Neumann-Wigner type result is proved: The set of potentials $a: \Gamma \rightarrow \mathbf{R} (\Gamma \subseteq \mathbf{Z}^N)$, with the property ...

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 ...

The study of eigenvalue estimates in Riemannian Geometry is a dynamic area that bridges geometric analysis and spectral theory. Eigenvalue bounds not only characterise the intrinsic geometry of ...

Introduces linear algebra and matrices with an emphasis on applications, including methods to solve systems of linear algebraic and linear ordinary differential equations. Discusses vector space ...