منابع مشابه
Levelling an unknotting tunnel
It is a consequence of theorems of Gordon–Reid [4] and Thompson [8] that a tunnel number one knot, if put in thin position, will also be in bridge position. We show that in such a thin presentation, the tunnel can be made level so that it lies in a level sphere. This settles a question raised by Morimoto [6], who showed that the (now known) classification of unknotting tunnels for 2–bridge knot...
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Certain major ancient engineering constructions, such as aqueducts and qanats, testify to high accuracies in the computation of elevation differences obtained using primitive levelling instruments. Based on the typology of ancient levelling instruments and the analysis of certain key ancient structures such as the (Eupalinos) tunnel at Samos Island (Greece), it became possible to specify the ac...
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ژورنال
عنوان ژورنال: Minutes of the Proceedings of the Institution of Civil Engineers
سال: 1920
ISSN: 1753-7843
DOI: 10.1680/imotp.1920.14942