“…Here, Φ( x, t, D) is a common element of the class, the real function ϕ( ξ, t, D) belongs to the Schwartz space S in variables ξ, smoothly depends on t and regularly depends on √ D as D → 0, ∆ x = x − X(t, D). The real smooth functions X(t, D) and S(t, D), characterizing the class P t D , regularly depend on √ D as D → 0 and are to be determined when constructing a solution to the Equation (7).…”