The Rank Organisation Davis cut staff, reduced budgets and concentrated film production at Pinewood. Other studio facilities (in Islington) were closed, sold (Lime Grove Studios) or leased (Denham). The Rank Organisation closed Independent Producers Ltd. The policies of Davis alienated many in the industry, in particular they led film director David Lean, responsible for some of Rank's most critically and financially successful films, to look elsewhere for backing. In 1949, the company bought the Bush Radio manufacturing facility and began to diversify its interests. In the early 1960s Rank took over Murphy Radio to form the Rank Bush Murphy Group (which was eventually
Tsen rank Tsen rank In mathematics, the Tsen rank of a field describes conditions under which a system of polynomial equations must have a solution in the field. The concept is named for C. C. Tsen, who introduced their study in 1936. We consider a system of "m" polynomial equations in "n" variables over a field "F". Assume that the equations all have constant term zero, so that (0, 0, ... ,0) is a common solution. We say that "F" is a T-field if every such system, of degrees "d", ..., "d" has a common non-zero solution whenever The "Tsen rank" of