By Hari Kishan

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In keeping with papers on the Intl Workshop on Differential Equations and optimum keep watch over held lately at Ohio collage, Athens.

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Moreover their performance is in many cases quite impressive. Consumers like them. Within London one sees them widely, but I doubt if there is very much off-road use in Kensington and Chelsea! 12 EU15 % new vehicle registrations 10 UK 8 6 4 2 0 1988 1990 1992 1994 1996 1998 2000 2002 2004 Figure 8: Historical sales of FWD in the EU15 countries (Improver Project, Interim Report 2005) Now let us consider how SUVs interface with saloon cars in collisions. As a rough rule of thumb, in a side impact one can save a car occupant if there is little or no impact to the head or thorax, and if the forces to the pelvis are sub-critical.

We will now call X ∈ F ⊆ R+N+K a variable demand logit equilibrium if Xijr = Tijexp(θCijr(X)){∑sexp(θCijs(X))}1 ∀ij . (5) This happens if and only if X ∈ F (or Tij ∑rXijr = 0 ∀ij and Xijr > 0 ∀ijr) and also there are positive numbers Mij > 0 such that: Xijr = Mijexp(θCijr(X)) ∀ijr . (6) The multipliers Mij may be called balancing factors and are there to ensure that eventually X ∈ F. Of course: Mij = Tij{∑sexp(θCijs(X))}1 ∀ij at a logit equilibrium. A natural objective function in this case is Vstoch where Vstoch(X) = ∑ijr {[Tijexp(θCijr(X)) Xijr][∑sexp(θCijs(X))]1}2 for all flow vectors X.

Here [x]+ = max{x, 0}. This is the objective function utilised by algorithm (D) in Smith (1984a, b). The algorithm (D) search direction is now defined for each routeflow vector X in F by: Δ(X) = Σijr [C(X)⋅( Wijr(X) X)]+ (Wijr(X) X) . Smith (1984a, b) showed that provided the cost function C(⋅) is monotone and continuously differentiable then, away from equilibrium, this Δ(X) is a descent direction at X for this V. Provided the step lengths are Armijo and other natural conditions hold then following this Δ leads to the set of equilibria.