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Telecommunications network

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A telecommunications network is a network of telecommunications links arranged so that messages may be passed from one part of the network to another over multiple links.

Telecommunications network links may in turn be built out of hierarchical transmission systems.

Examples of telecommunications networks are:

See also:



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Five lemma

... s(m(b)) = n(g(b)) = n(c) = 0. By exactness, there is then an element a' of A' such that r(a') = m(b). Since l is surjective, there is a in A such that l(a) = a'. ...