A Class of Evolutionary Problems with an Application to Acoustic Waves   with Impedance Type Boundary Conditions
  A class of evolutionary operator equations is studied. As an application the equations of linear acoustics are considered with complex material laws. A dynamic boundary condition is imposed which in the time-harmonic case corresponds to an impedance or Robin boundary condition. Memory and delay effects in the interior and also on the boundary are built into the problem class. 
Rainer Picard
math.AP math.DS