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  2. Glossary of mathematical symbols - Wikipedia

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

    ∏ (capital-pi notation) 1. Denotes the product of a finite number of terms, which are determined by subscripts and superscripts (which can also be placed below and above), such as in = or < < <. 2. Denotes an infinite product

  3. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    Modifying the condition in this way can make a problem either harder or easier to solve (intuitively, it is harder to justify a positive answer but might be easier to justify a negative one). Kurtz and Simon [ 34 ] proved that the universally quantified problem is, in fact, undecidable and even higher in the arithmetical hierarchy ...

  4. The Rockford Files - Wikipedia

    en.wikipedia.org/wiki/The_Rockford_Files

    The Rockford Files is an American detective drama television series starring James Garner that aired on the NBC network from September 13, 1974, to January 10, 1980. Garner portrays Los Angeles private investigator Jim Rockford, with Noah Beery Jr. in the supporting role of his father, Joseph "Rocky" Rockford, a retired truck driver.

  5. Hyperbolic geometry - Wikipedia

    en.wikipedia.org/wiki/Hyperbolic_geometry

    Hyperbolic geometry is generally introduced in terms of the geodesics and their intersections on the hyperbolic plane. [38] Once we choose a coordinate chart (one of the "models"), we can always embed it in a Euclidean space of same dimension, but the embedding is clearly not isometric (since the curvature of Euclidean space is 0). The ...

  6. Wayback Machine - Wikipedia

    en.wikipedia.org/wiki/Wayback_Machine

    The Internet Archive began archiving cached web pages in 1996. One of the earliest known pages was archived on May 10, 1996, at 2:08 p.m. (). [5]Internet Archive founders Brewster Kahle and Bruce Gilliat launched the Wayback Machine in San Francisco, California, [6] in October 2001, [7] [8] primarily to address the problem of web content vanishing whenever it gets changed or when a website is ...

  7. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    View from the Swabian Jura to the Alps. Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length.. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude.

  8. Islam - Wikipedia

    en.wikipedia.org/wiki/Islam

    Islam [a] is an Abrahamic monotheistic religion centred on the Quran and the teachings of Muhammad, [9] the religion's founder. Adherents of Islam are called Muslims, who are estimated to number 1.9 billion worldwide and are the world's second-largest religious population after Christians.