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A 3-dimensional rendering of the ribbon knot , showing the ribbon property. In the mathematical area of knot theory, a ribbon knot is a knot that bounds a self-intersecting disk with only ribbon singularities. Intuitively, this kind of singularity can be formed by cutting a slit in the disk and passing another part of the disk through the slit.
A framed knot is the extension of a tame knot to an embedding of the solid torus D 2 × S 1 in S 3. The framing of the knot is the linking number of the image of the ribbon I × S 1 with the knot. A framed knot can be seen as the embedded ribbon and the framing is the (signed) number of twists. [8] This definition generalizes to an analogous ...
Duck's ass or D.A. The ducktail is a men's haircut style popular during the 1950s. It is also called the duck's tail, duck's ass, duck's arse, or simply D.A. and is also described as slicked back hair. [1] [2] The hair is pomaded (greased), combed back around the sides, and parted centrally down the back of the head.
Get the most out of your cutting boards with these easy tricks. In The Know by Yahoo. Use cookie cutters in fun shapes and sizes for these easy kitchen crafts. In The Know by Yahoo.
The second method involves introducing a short piece of rope of the same type as the main rope, and cutting that instead. This can be accomplished by many sleight of hand tricks but attaching it to the main rope disguised as the loop of a knot is the most common method. When the performer removes the knot, the original rope is completely uncut. [1]
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Bowen knot (heraldic knot) – not a true knot (an unknot), a continuous loop of rope laid out as an upright square shape with loops at each of the four corners; Bowline – forms a fixed loop at the end of a rope; Boling knot (archaic term for the Bowline) – forms a fixed loop at the end of a rope; Bowline bend
Friction knots are held in place by the friction between the windings of line. Knotted-ends knots are held in place by the two ends of the line being knotted together. Stopping may be either a temporary whipping or seizing, the commonest variety consisting of a few round turns finished off with a reef knot .