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Ultranet can refer to one of the following: * Ultranet (company), a former telecommunications firm in Massachusetts, United States * Ultranet (math), a term in topology * , a HVDC-project in Germany * Ultranet (product) The Ultranet was an online learning management system developed for the Victorian Department of Education and Early Childhood Development in Australia to provide extensive services to students, parents and teachers in government schools. The Ul ...

Ultranet (company)
RCN Corporation, originally Residential Communications Network, founded in 1993 and based in Princeton, New Jersey, was the first American facilities-based ("overbuild") provider of bundled telephone, cable television, and internet service delivered over its own fiber-optic local network as well as dialup and Digital subscriber line, DSL Internet service provider, Internet service to consumers in the Boston, Chicago, Los Angeles, New York City, the Lehigh Valley in eastern Pennsylvania, and Washington, D.C. areas. , RCN claimed over 424,000 domestic customers and 130 cable franchises. RCN's network offered coverage to approximately 3.8 million people, making it the 11th largest provider of cable Internet access in the U.S. Its operations, as well as sister companies Grande Communications, and Wave Broadband are handled under affiliate Patriot Media Consulting. RCN serves in or around the following locations: Allentown, Pennsylvania, Allentown, Boston, Chicago (limited coverag ...
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Ultranet (math)
In mathematics, more specifically in general topology and related branches, a net or Moore–Smith sequence is a generalization of the notion of a sequence. In essence, a sequence is a function whose domain is the natural numbers. The codomain of this function is usually some topological space. The motivation for generalizing the notion of a sequence is that, in the context of topology, sequences do not fully encode all information about functions between topological spaces. In particular, the following two conditions are, in general, not equivalent for a map f between topological spaces X and Y: #The map f is continuous in the topological sense; #Given any point x in X, and any sequence in X converging to x, the composition of f with this sequence converges to f(x) (continuous in the sequential sense). While it is necessarily true that condition 1 implies condition 2 (The truth of the condition 1 ensures the truth of the conditions 2.), the reverse implication is not nece ...
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