Abstract:
We present the solution of the Cauchy problem (the initial-value problem in the whole space) for the wave equation with infinite-dimensional Lévy Laplacian $\Delta _L$,
$$
\frac{\partial^2 U(t,x)}{\partial t^2}=\Delta_LU(t,x)
$$
in two function classes, the Shilov class and the Gâteaux class.
Keywords:wave equation, hyperbolic equation, Lévy Laplacian, Cauchy problem, Shilov function class, Gâteaux function class, Hilbert space, variational derivative.