The document discusses solving the problem of determining if a polyhedron can be removed from its mold using linear programming. It presents an incremental linear programming algorithm that takes a set of half-plane constraints and finds a point that satisfies them in linear expected time. This is done by randomly ordering the half-planes and iterating through them, updating the feasible region and optimal point at each step. The algorithm reduces the casting problem to solving a linear program to find a single feasible solution.