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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.
[12] In 1936 Ray-Ban had been founded as a civilian division of Bausch & Lomb. This style of sunglasses is credited with being one of the first popularized styles of sunglasses to be developed. [16] In its military usage, the sunglasses replaced the outmoded flight goggles used previously, as they were lighter, thinner, and "more elegantly ...
Maximum and minimum. Local and global maxima and minima for cos (3π x)/ x, 0.1≤ x ≤1.1. In mathematical analysis, the maximum and minimum[a] of a function are, respectively, the largest and smallest value taken by the function. Known generically as extremum, [b] they may be defined either within a given range (the local or relative extrema ...
The Riemann sphere can be visualized as the complex number plane wrapped around a sphere (by some form of stereographic projection – details are given below).. In mathematics, the Riemann sphere, named after Bernhard Riemann, [1] is a model of the extended complex plane (also called the closed complex plane): the complex plane plus one point at infinity.
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Any pair of points on a sphere that lie on a straight line through the sphere's center (i.e., the diameter) are called antipodal points – on the sphere, the distance between them is exactly half the length of the circumference. [note 2] Any other (i.e., not antipodal) pair of distinct points on a sphere lie on a unique great circle,