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Call routing in telephone networks
Find out how modern telephone networks use mathematics to make it possible for a person to dial a friend in another country just as easily as if they were in the same street, or to read web pages that are on a computer in another continent.
Agner Krarup Erlang (1878 - 1929)
The mathematics underlying today's complex telephone networks is still based on his work. Erlang was the first person to study the problem of telephone networks.