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 this article) assume that a directed set is directed upward, unless otherwise stated. Beware that other authors call a set directed if and only if it is directed both upward and downward. Directed sets are a generalization of nonempty totally ordered sets. That is, all totally ordered sets are directed sets (contrast "partially" ordered sets, which need not be directed). Join semilattices (which are partially ordered sets) are directed sets as well, but not conversely. Likewise, lattices are directed sets both upward and downward. In topology, directed sets are used to define nets, which generalize sequences and unite the various