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  2. Knuth's up-arrow notation - Wikipedia

    en.wikipedia.org/wiki/Knuth's_up-arrow_notation

    Knuth's up-arrow notation. In mathematics, Knuth's up-arrow notation is a method of notation for very large integers, introduced by Donald Knuth in 1976. [1] In his 1947 paper, [2] R. L. Goodstein introduced the specific sequence of operations that are now called hyperoperations. Goodstein also suggested the Greek names tetration, pentation ...

  3. Portal (video game) - Wikipedia

    en.wikipedia.org/wiki/Portal_(video_game)

    Single-player. Portal is a 2007 puzzle - platform game developed and published by Valve. It was released in a bundle, The Orange Box, for Windows, Xbox 360 and PlayStation 3, and has been since ported to other systems, including Mac OS X, Linux, Android (via Nvidia Shield ), and Nintendo Switch . Portal consists primarily of a series of puzzles ...

  4. Login - Wikipedia

    en.wikipedia.org/wiki/Login

    Login. In computer security, logging in (or logging on, signing in, or signing on) is the process by which an individual gains access to a computer system or program by identifying and authenticating themselves. The user credentials are typically some form of a username and a password, [1] and these credentials themselves are sometimes referred ...

  5. Machu Picchu - Wikipedia

    en.wikipedia.org/wiki/Machu_Picchu

    1983 (7th Session) Area. 38,160.87 ha. Machu Picchu is a 15th-century Inca citadel located in the Eastern Cordillera of southern Peru on a 2,430-meter (7,970 ft) mountain ridge. [2] [3] Often referred to as the "Lost City of the Incas", it is the most familiar icon of the Inca Empire. It is located in the Machupicchu District within Urubamba ...

  6. Business Model Canvas - Wikipedia

    en.wikipedia.org/wiki/Business_Model_Canvas

    The Business Model Canvas is a strategic management template used for developing new business models and documenting existing ones. [2] [3] It offers a visual chart with elements describing a firm's or product's value proposition , [4] infrastructure, customers, and finances, [1] assisting businesses to align their activities by illustrating ...

  7. Portal vein - Wikipedia

    en.wikipedia.org/wiki/Portal_vein

    The portal vein or hepatic portal vein ( HPV) is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas and spleen to the liver. This blood contains nutrients and toxins extracted from digested contents. Approximately 75% of total liver blood flow is through the portal vein, with the remainder coming from the ...

  8. Old Testament - Wikipedia

    en.wikipedia.org/wiki/Old_Testament

    v. t. e. The Old Testament ( OT) is the first division of the Christian biblical canon, which is based primarily upon the 24 books of the Hebrew Bible, or Tanakh, a collection of ancient religious Hebrew and occasionally Aramaic writings by the Israelites. [1] The second division of Christian Bibles is the New Testament, written in Koine Greek .

  9. Adidas - Wikipedia

    en.wikipedia.org/wiki/Adidas

    Adidas AG (German pronunciation: [ˈʔadiˌdas] ⓘ; stylized in all lowercase since 1949) is a German athletic apparel and footwear corporation headquartered in Herzogenaurach, Bavaria, Germany.