Teltow (region)
Teltow ['tɛltoː] is both a geological plateau and also an historical region in the German states of Brandenburg and Berlin. As an historical region, the Teltow was one of the eight territories out of which the March of Brandenburg was formed in the 12th and 13th centuries. As a result of the Teltow War (1239–1245) the question of territorial lordship of the newly created heart of the expanding march was finally decided here. Between 1816 and 1952 there was also a county, Landkreis Teltow; in addition a town immediately south of Berlin, in the present-day county of Potsdam-Mittelmark, bears the name Teltow.
Geography and geology
Boundary
The Teltow is not a unified region, either from a historical or a landscape perspective. The present-day term is defined by an ice age plateau that consists mainly of ground moraine elements. Its natural borders are formed by the rivers Dahme to the east, the Spree to the north and the Havel and Nuthe to the west. To the southwest, the countryside around the Pfefferfließ is also counted as part of the Teltow, although it has no clear boundaries. The regional border in the south is unclear, because the ground moraines here were often eroded by urstromtal processes. For example, there are many small island plateaux. The boundary of the cultural landscape is general seen as the Baruth Urstromtal. Further south is the heathland of the Fläming.
Ü (region)
Ü (Tibetan: དབུས་, Wylie: dbus, ZYPY: Wü ; pronounced w-yu, similar to English word "we") is a geographic division and a historical region in Tibet. Together with Tsang (Tib. གཙང་, gtsang), it forms Central Tibet Ü-Tsang (Tib. དབུས་གཙང་, Wyl. dbus gtsang), which is one of the three Tibetan regions or cholka (cholka-sum). The other two cholka are Kham (Tib. ཁམས་, Wyl. khams) (Dotod) and Amdo (Tib. ཨ༌མདོ;Wyl. a mdo) (Domed). According to a Tibetan saying, "the best religion comes from Ü-Tsang, the best men from Kham, and the best horses from Amdo".
Constituent districts
Taken together, Ü and Tsang are considered to be the center of Tibetan civilization, from historical, cultural, political and economic perspectives. They are centered on the valley of the Yarlung Tsangpo River, which flows eastward at about 3,600 metres (11,800 ft) above sea level. Of this territory, Ü constitutes the eastern portion, up to Sokla Kyao in the east where it borders to Kham. It includes the Lhasa River valley system, where Lhasa is situated, and the Yarlung and Chonggye valleys to the south of the Tsangpo.
List of regions of Quebec
The province of Quebec, Canada, is officially divided into 17 administrative regions. Traditionally (and unofficially), it is divided into around twenty regions. As of the 2011 Canadian Census, the population of Quebec was 7,903,001, the land area was 1,356,547.02 km2 and the population density was 5.8 inhabitants per square kilometre.
Administrative
Administrative regions are used to organize the delivery of provincial government services. They are also the basis of organization for regional conferences of elected officers (French: conférences régionales des élus, CRÉ), with the exception of the Montérégie and Nord-du-Québec regions, which each have three CRÉs or equivalent bodies. (In the Nord-du-Québec region, the Kativik Regional Government and Cree Regional Authority, in addition to their other functions, play the role of a CRÉ).
List
The subregions of Montérégie and Nord-du-Québec have their own regional conference of elected officers (CRÉ). Municipalities with 20,000-plus populations in the 2011 Census are listed, with those 50,000 or over bolded. In addition, the seat of the relevant CRÉ is indicated, as well as other major cities and towns. If the population of a CRÉ is less than 20,000, it is shown in italics.
Region (mathematics)
In mathematical analysis, the word region usually refers to a subset of 
or 
that is open (in the standard Euclidean topology), connected and non-empty. A closed region is sometimes defined to be the closure of a region.
Regions and closed regions are often used as domains of functions or differential equations.
According to Kreyszig,
According to Yue Kuen Kwok,
See also
Notes and references
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