... that (1 3) (L(X) + a(z)F(z )) ( u1 - ~ 2) = 0 in R .T[.c(W + a(z)F(z), B(-V(z) + b(z)G(z))l > > CTf[L(X) + a(z)u;-l, B(-V(z) + b(z)u;-l)] = 0. Then, Problem (1 3)~ is ... ~(~)E"-'(P)P"~(P )) (1 9) g=~(p)cp(p) =O on ro. (2 0) and Thus, thanks to Eqs. (1 7), (1 8), (1 9) and (2 0), 21 satisfies C(X)u + a(z)gT < 0 in R I f?(-V(z) ... ~F[c(x),D(-v( ~) + p)] = @[l( ~), f?(-v(z))I (1 5) and 4[W>, a(-v(zc))l < .F[W),WV(4 + PI1 (1 6) for all p > 0. Then, taking into account Eqs. (1 4), (1 5) and (1 6), it is...