Nonlocal Cauchy problems for wave equations and applications
  In this paper, the existence, the uniqueness and estimates of solution to the
integral Cauchy problem for linear and nonlinear abstract wave equations are
proved. The equation includes a linear operator A defined in a Banach space E,
in which by choosing E and A we can obtain numerous classis of nonlocal initial
value problems for wave equations which occur in a wide variety of physical
systems.
