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26 Optimal Vertex

Input: H-description of a polyhedron P ⊂ Qd, cQd
Output: inf { cTv : v vertex of P } ∈ Q ∪ {∞ } and, if the infimum is finite, a vertex where the infimum is attained.
Status (general): Strongly NP-hard
Status (fixed dim.): Polynomial time
Proved to be strongly NP-hard by Fukuda, Liebling, and Margot [22]. By linear programming this problem can be solved in polynomial time if P is a polytope. In fixed dimension one can compute all vertices of P in polynomial time (see Problem 1).

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