Quantum mechanics continues to offer profound insights into the fundamental nature of matter and energy, and the use of special functions plays a critical role in obtaining exact analytical solutions ...

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 paper is motivated by the observation that solutions to certain variational inequalities involving partial differential operators of the form $\operatorname{div} A(x, u, \nabla u) + B(x, u, ...