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Ray-Ban is a brand of luxury sunglasses and eyeglasses created in 1936 by Bausch & Lomb. The brand is best known for its Wayfarer and Aviator lines of sunglasses. In 1999, Bausch & Lomb sold the brand to Italian eyewear conglomerate Luxottica Group for a reported $640 million.
Aviator style sunglasses are intended to be worn under headgear and are characterised by dark, oftentimes reflective lenses and thin monel, steel or titanium metal frames with double or triple bridges and bayonet earpieces or flexible cable temples that hook more securely behind the ears. [1]
1950s singer Buddy Holly helped popularise Wayfarers. Ray-Ban Wayfarer sunglasses and eyeglasses have been manufactured by Ray-Ban since 1952. Made popular in the 1950s and 1960s by music and film icons such as Buddy Holly, Roy Orbison and James Dean, Wayfarers almost became discontinued in the 1970s, before a major resurgence was created in the 1980s through massive product placements.
The choosability (or list colorability or list chromatic number) ch(G) of a graph G is the least number k such that G is k-choosable. More generally, for a function f assigning a positive integer f(v) to each vertex v, a graph G is f-choosable (or f-list-colorable) if it has a list coloring no matter how one assigns a list of f(v) colors to ...
Some of the more well-known topics in recreational mathematics are Rubik's Cubes, magic squares, fractals, logic puzzles and mathematical chess problems, but this area of mathematics includes the aesthetics and culture of mathematics, peculiar or amusing stories and coincidences about mathematics, and the personal lives of mathematicians.
In graph theory, circular coloring is a kind of coloring that may be viewed as a refinement of the usual graph coloring. The circular chromatic number of a graph G {\displaystyle G} , denoted χ c ( G ) {\displaystyle \chi _{c}(G)} can be given by any of the following definitions, all of which are equivalent (for finite graphs).
Emmanuel L. Osorio, one of the founders of the Ninth Ray movement, also came up with a proposal adding not only a ninth ray to the flag's sun but adding a fourth star to the flag, representing North Borneo (present-day Sabah), a territory claimed by the Philippines but currently under Malaysian sovereignty. The flag's triangle is changed into a ...