Minority Report (film) Spielberg also offered the role of Witwer to Javier Bardem, who turned it down. After "E.T.", Spielberg started to consult experts, and put more scientific research into his science fiction films. In 1999, he invited fifteen experts convened by Peter Schwartz and Stewart Brand to a hotel in Santa Monica for a three-day "think tank". He wanted to consult with the group to create a plausible "future reality" for the year 2054 as opposed to a more traditional "science fiction" setting. Dubbed the "think tank summit", the experts included architect Peter Calthorpe, author Douglas Coupland, urbanist and journalist Joel Garreau,
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