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  2. Metropolitan statistical area - Wikipedia

    en.wikipedia.org/wiki/Metropolitan_Statistical_Area

    The statistical criteria for a standard metropolitan area were defined in 1949 and redefined as a metropolitan statistical area in 1983. [3] A typical metropolitan area is polycentric and no longer monocentric due to suburbanization of employment and has a large historic core city, such as New York City or Chicago. [4]

  3. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...

  4. Gamma function - Wikipedia

    en.wikipedia.org/wiki/Gamma_function

    Calculus, mathematical analysis, statistics, physics. In mathematics, the gamma function (represented by Γ, the capital letter gamma from the Greek alphabet) is one commonly used extension of the factorial function to complex numbers. The gamma function is defined for all complex numbers except the non-positive integers.

  5. Genghis Khan - Wikipedia

    en.wikipedia.org/wiki/Genghis_Khan

    The History of Yuan, vol 121 (1370) Retreating southeast to Baljuna, an unidentified lake or river, Temüjin waited for his scattered forces to regroup: Bo'orchu had lost his horse and was forced to flee on foot, while Temüjin's badly wounded son Ögedei had been transported and tended to by Borokhula, a leading warrior. Temüjin called in every possible ally and swore a famous oath of ...

  6. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    In 1629, Isaac Beeckman proposed an experiment in which a person observes the flash of a cannon reflecting off a mirror about one mile (1.6 km) away. In 1638, Galileo Galilei proposed an experiment, with an apparent claim to having performed it some years earlier, to measure the speed of light by observing the delay between uncovering a lantern ...

  7. Twitch (service) - Wikipedia

    en.wikipedia.org/wiki/Twitch_(service)

    Twitch is an American video live-streaming service that focuses on video game live streaming, including broadcasts of esports competitions, in addition to offering music broadcasts, creative content, and "in real life " streams. Twitch is operated by Twitch Interactive, a subsidiary of Amazon. [4] It was introduced in June 2011 as a spin-off of ...