5. (*, 35 marks) An isotropic stored-energy ?(v1, v2, v3) is said to satisfy the Baker-Ericksen inequalities if for vi > 0 ad ad Vi avi - Uj avi > 0, whenever vi # vj. (*) Vi - Uj (b) Show that (*) is satisfied for any function of the form $(v1, U2, V3) = v2 + uz + 13 + h(v102V3), where h : R - R is smooth