Representation of Classical Solutions to a Linear Wave Equation with   Pure Delay
  For a wave equation with pure delay, we study an inhomogeneous initial-boundary value problem in a bounded 1D domain. Under smoothness assumptions, we prove unique existence of classical solutions for any given finite time horizon and give their explicit representation. Continuous dependence on the data in a weak extrapolated norm is also shown. 
Denys Khusainov, Michael Pokojovy, Elvin Azizbayov
math.AP