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Unit ball - In mathematics, a unit sphere is the set of points of distance 1 from a fixed central point, where a generalized concept of distance may be used. A unit ball is the region enclosed by a unit sphere.
Extra (cricket) - In the sport of cricket, an extra is a run scored by a means other than a batsman hitting the ball. Extras are also sometimes called sundries.
Test Match Special - Test Match Special (known as TMS) is a radio programme broadcast on BBC Radio 4 (long wave), Five Live Sports Extra (digital) and available live from the BBC website. TMS provides ball-by-ball coverage of many Test cricket and One Day International matches involving the England cricket team.
Brouwer fixed point theorem - In mathematics, the Brouwer fixed point theorem states that every continuous function from the closed unit ball D n to itself has a fixed point. In this theorem, n is any positive integer, and the closed unit ball is the set of all points in Euclidean n-space Rn which are at distance at most 1 from the origin.
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