The problem of calculating the eigensystem of a general complex matrix is well known. In many cases, however, the eigensystem is poorly determined numerically in the sense that small changes in the ...

Let X, Y be two subspaces of summability domains of matrices with real or complex entries determined by speeds of the convergence, i.e.; by monotonically increasing positive sequences λ and μ. In this ...

The Maslov index is a fundamental topological invariant that plays a critical role in the study of Hamiltonian systems. Originating from the realms of symplectic geometry and semi-classical analysis, ...