Technologies in Minority Report autonomously; in one scene the police remotely override the vehicle in order to bring him into custody. Spielberg commissioned Lexus to design a car specifically for Minority Report, resulting in the Lexus 2054, a fuel-cell powered autonomous vehicle which is seen being built in an automated factory in the film. Autonomous, or self-driving cars have been in development since 1984. As Artificial Intelligence and ground-sensing technologies like LIDAR began to improve in the 2000's, major automotive manufacturers such as Ford, Nissan and General Motors began developing self-driving prototypes. Google began developing a self-driving vehicle prototype, named Waymo in 2009 while
Directed set While the definition of a directed set is for an "upward-directed" set (every pair of elements has an upper bound), it is also possible to define a downward-directed set in which every pair of elements has a common lower bound. A subset of a poset is downward-directed if and only if its upper closure is a filter. Directed subsets are used in domain theory, which studies directed complete partial orders. These are posets in which every upward-directed set is required to have a least upper bound. In this context, directed subsets again provide a generalization of convergent sequences. Directed set