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Givenchy vintage gold necklace consisting of a rigid centerpiece and a flexible omega chain around the back of the neck. An omega chain or omega necklace is a pseudo-chain made by assembling metallic plates on a wire or woven mesh. The plates give the appearance of links in a chain.
For this reason, a necklace might also be called a fixed necklace to distinguish it from a turnover necklace. Formally, one may represent a necklace as an orbit of the cyclic group acting on n -character strings over an alphabet of size k , and a bracelet as an orbit of the dihedral group .
Unlike the usual problem of graph coloring, the necklaces are assumed to be aperiodic (not consisting of repeated subsequences), and counted up to rotation (rotating the beads around the necklace counts as the same necklace), but without flipping over (reversing the order of the beads counts as a different necklace). This counting function also ...
A keychain (/ ˈ k i t ʃ eɪ n / ⓘ) (also keyring) is a small ring or chain of metal to which several keys, or fobs can be attached. The terms keyring & keychain are often used interchangeably to mean both the individual ring, or a combined unit of a ring and fob.
In Ancient Babylon, necklaces were made of carnelian, lapis lazuli, agate, and gold, which was also made into gold chains. [6] Ancient Sumerians created necklaces and beads from gold, silver, lapis lazuli and carnelian. [6] In Ancient Egypt, a number of different necklace types were worn.
The information specifies how many copies the necklace contains of each possible arrangement of black beads. For instance, for k = 2 {\displaystyle k=2} , the specified information gives the number of pairs of black beads that are separated by i {\displaystyle i} positions, for i = 0 , … , ⌊ n / 2 − 1 ⌋ {\displaystyle i=0,\dots ,\lfloor ...
In organometallic chemistry, a migratory insertion is a type of reaction wherein two ligands on a metal complex combine. It is a subset of reactions that very closely resembles the insertion reactions, and both are differentiated by the mechanism that leads to the resulting stereochemistry of the products.
Two gold nameplate necklaces . A nameplate necklace [1] (also known as a name necklace) is a type of necklace which displays a name, initials, or other words of choice. [2] Originating among African-American and Latino communities during the 1980s and 1990s, [1] nameplate necklaces have become a popular fashion piece all around the world. [3]
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