Note that one may put variational inequality (23) into standard form (21) by letting
F ≡ C, X ≡ x, and K ≡ K1. Also, one may put variational inequality (25) into standard
form where now F ≡ c, X ≡ f, and K ≡ K2. Hence, fixed demand transportation network
equilibrium problems in the case of asymmetric user link cost functions can be solved as
variational inequality problems, as given above