The aim of this paper is to consider the radially-symmetric periodic-Dirichlet problem on [0, T] × Bn[a] for the equation utt - Δ u = f(t, |x|, u), where Δ is the classical Laplacian operator, and ...

This is a preview. Log in through your library . Abstract We consider a parametric family of integral equations of the first kind, which can be treated as index transformations and generalize ...

Spectral theory provides a rigorous framework for analysing the eigenvalues and eigenfunctions of differential operators that play an essential role in mathematical physics. In particular, ...