What is common between Delta of the river and syntactic analysis?
Many large rivers, flowing into the sea, branch on numerous channels. They fan-shaped disperse on ground outstanding in the sea, which refers to as delta. This name has entered in V century up to AD by ancient Greek historian Gerodot who has noticed similarity between the triangular form of a mouth of Nile and the header Greek letter "delta" (Δ).
To model treelike objects and processes in Mathematics an abstract structure - a tree-graph is used. It turned out that natural language sentence also has branching hierarchical structure: word subordination form a tree.
See DictaScope.
 Nile river, Africa © WeatherStreet.com |
 Indus river, Pakistan © NASA |
 Niger river, Africa © NASA |
 Volga river, Russia © Image courtesy of USGS National Center for EROS and NASA Landsat Project Science Office |
 Colorado river, Mexico © Trent University |
 Ural river, Russia © NASA |
 Mississippi river, USA © Courtesy NASA/JPL-Caltech |
 Severnaya Dvina river, Russia © The Norwegian Barents Secretariat |
 Gand and Brahmaputra river, India © NASA |
 Yukon river, Canada © NASA |
 Narsarsuaq river, Greenland © Stephen Codrington |
 Lena river, Russia © Image courtesy of USGS National Center for EROS and NASA Landsat Project Science Office |