**Some Differential Estimates in Linear Programming**

* Nguyen Nang Thieu*

**Abstract**

This paper proposes two sets of formulas for the sensitivity analysis of the optimal value function of a parametric linear programming problem. The first one evaluates the changes of the optimal value with respect to perturbations of the right-hand side vector in the constraint system and of the cost vector. The second one gives a lower bound and an upper bound for the Dini directional derivative of the optimal value function.