“…The operator L in (1.2) arises naturally in the study of pure Lévy stochastic processes with the jump interaction measure ν(h)dh. Analogous to the classical case, attempts have been made recently (see, e.g., [19]), where elliptic and parabolic problems related to this type of nonlocal operators are studied, see also [12,13,14,15] where various other typical studies related to this of nonlocal operator are considered.…”