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Every non-trivial knot has bridge number at least two, [1] so the knots that minimize the bridge number (other than the unknot) are the 2-bridge knots. It can be shown that every n-bridge knot can be decomposed into two trivial n-tangles and hence 2-bridge knots are rational knots. If K is the connected sum of K 1 and K 2, then the bridge ...
The names rational knot and rational link were coined by John Conway who defined them as arising from numerator closures of rational tangles. This definition can be used to give a bijection between the set of 2-bridge links and the set of rational numbers; the rational number associated to a given link is called the Schubert normal form of the link (as this invariant was first defined by ...
The Braga Bridge is a continuous truss bridge. It was the fourth longest span of this type when it was completed in 1966. This list of continuous bridge spans ranks the world's continuous truss bridges in two listings: The first is ranked by the length of main span (the longest length of unsupported roadway) and the second by the total length of continuous truss spans.
The definition of cable-stayed bridge deck length used here is: A continuous part of the bridge deck that is supported only by stay-cables and pylons, or are free spans. This means that columns supporting the side span as for example found in Pont de Normandie , excludes most of the side span decks from the cable-stayed deck length.
A Bimini twist creates a loop at the end of the line in which it is tied. The loop is secured at the top with a long barrel of coiled line created by the tying process. A Bimini twist loop is stronger than the line itself. It is one of the rare knots that does not weaken the line in which it is tied.
It is a natural bid, used to show a hand that is too strong to open at the one level. Commonly used in the early days of bridge, most expert players converted after World War II to the now more common weak two bid [2] retaining only 2 ♣ as a strong opening suit-bid and changing its meaning to artificial and forcing holding any suit. This was ...
Most SNP [1] ("Bridge of the Slovak National Uprising"), commonly referred to as Most Slovenského národného povstania or the UFO Bridge, and named Nový most ("New Bridge") from 1993 to 2012, is a road bridge over the Danube in Bratislava, the capital of Slovakia. It is the world's longest bridge to have one pylon and one cable-stayed plane.
The unknotting number of a knot is always less than half of its crossing number. [2] This invariant was first defined by Hilmar Wendt in 1936. [3] Any composite knot has unknotting number at least two, and therefore every knot with unknotting number one is a prime knot. The following table show the unknotting numbers for the first few knots: