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The development of the OSA-UCS took place during many years, from 1947 to 1977. Not long after the first mathematical color model was developed by the CIE, David MacAdam showed that when selecting a color on the CIE chromaticity diagram, it could not be guaranteed that colors of the same perceived color difference around this color were at the same color distance with respect to the reference ...
Fencing practice and techniques of modern competitive fencing are governed by the International Fencing Federation (FIE), though they developed from conventions developed in 18th- and 19th-century Europe to govern fencing as a martial art and a gentlemanly pursuit. The modern weapons for sport fencing are the foil, épée, and sabre. [1] [2]
Piste – The fencing area, roughly 14 by 2 metres (45.9 ft × 6.6 ft). The last two metres on each end is hash-marked, to warn a fencer before he/she backs off the end of the strip. Retreating off the end of the strip with both feet gets a touch against. Going off the side of the strip with one foot halts the fencing action.
Like other weapons used in fencing, the modern sabre uses an electrical connection to register touches. The sabreur wears a lamé, a conductive jacket, to complete the circuit and register a touch to a valid target. Sabre was the last weapon in fencing to make the transition over to using electrical equipment.
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Fencing socks are long enough to cover the knee; some cover most of the thigh. Shoes Fencing shoes have flat soles, and are reinforced on the inside for the back foot, and in the heel for the front foot. The reinforcement prevents wear from lunging. Mask The fencing mask has a bib that protects the neck.
The square tiling has 9 uniform colorings: 1111, 1112(a), 1112(b), 1122, 1123(a), 1123(b), 1212, 1213, 1234. In geometry, a uniform coloring is a property of a uniform figure (uniform tiling or uniform polyhedron) that is colored to be vertex-transitive.