Technologies in Minority Report newspaper" would be released, he predicted "around 2015." Tech Watch's 2008 article "‘Minority Report’ e-newspaper on the way" noted that Hearst was "pushing large amounts of cash into" the technology. Spielberg decided to add the jetpacks worn by the policemen as a tribute to old science-fiction serials such as Commando Cody, even though the scientists considered them unrealistic. The jet packs are the only future technology depicted in the film which originated in science fiction. They already exist and perhaps their most famous flights occurred in the pregame ceremonies before Super Bowl I in 1967 and in Los Angeles in
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