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Given some point in a topological space , the union of any collection of connected subsets such that each contains will once again be a connected subset. The connected component of a point in is the union of all connected subsets of that contain ; it is the unique largest (with respect to ) connected subset of that contains .
Entrance sign at the tunnels. Part of the tunnel complex at Củ Chu, this tunnel has been made wider and taller to accommodate tourists. The tunnels of Củ Chi (Vietnamese: Địa đạo Củ Chi) are an immense network of connecting tunnels located in the Củ Chi District of Ho Chi Minh City (Saigon), Vietnam, and are part of a much larger network of tunnels that underlie much of the country.
Vietnam is putting considerable effort into modernization and expansion of its telecommunication system. Domestically, all provincial exchanges are digitalized and connected to Hanoi, Da Nang and Ho Chi Minh City by fiber optic cable or microwave radio relay networks. Main lines have been substantially increased, and the use of mobile ...
In two dimensions, a circle is not simply connected, but a disk and a line are. Spaces that are connected but not simply connected are called non-simply connected or multiply connected. A sphere is simply connected because every loop can be contracted (on the surface) to a point. The definition rules out only handle-shaped holes. A sphere (or ...
A cellular network or mobile network is a telecommunications network where the link to and from end nodes is wireless and the network is distributed over land areas called cells, each served by at least one fixed-location transceiver (such as a base station).
The Vietnamese Wikipedia initially went online in November 2002, with a front page and an article about the Internet Society.The project received little attention and did not begin to receive significant contributions until it was "restarted" in October 2003 [3] and the newer, Unicode-capable MediaWiki software was installed soon after.
This plant is connected to the national electricity system by 110 kV voltage. [65] According to the Decision 2068/QD-TTg [66] on Approving the Viet Nam's Renewable Energy Development Strategy up to 2030 with an outlook to 2050: The rate of urban solid waste for energy targets is expected to increase up to 30% by 2020, and approximately 70% by 2030.
Vietnam has a population of 96 million people, and 34.9% [5] of the population is urban. Despite this, 53% [ 6 ] of the country's population currently has access to the Internet. According to a study conducted by market research company Statista [ 7 ] in 2016, more than 91 percent of daily Internet users were between the ages of 25 and 34. [ 8 ]