“…k---*oo provided that the system reaches a steady state. Letting k --~ oc in equation(2) and solvingfor P(x, z, y, w), we get [x-A(z)B(w)]P(x'z'Y'W) = xA(z)B(w) [{ Sl(x)xz ! } P(O,z,y,w)Since IA(z)B(w)] _< 1 and P(x, z, y, w) is analytical function in the closed polydisk Ixl, ]Yl, ]z[, Iwl < 1, the right-hand side (RHS) of equation(4)must be zero for x = A(z)B(w).…”