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  2. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    A number is a mathematical object used to count, ... The earliest known use of irrational numbers was in the Indian Sulba Sutras composed between 800 and 500 BC.

  3. Renewable energy - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy

    Renewable energy is more evenly distributed around the world than fossil fuels, which are concentrated in a limited number of countries. It also brings health benefits by reducing air pollution caused by the burning of fossil fuels. The potential worldwide savings in health care costs have been estimated at trillions of dollars annually.

  4. Display resolution - Wikipedia

    en.wikipedia.org/wiki/Display_resolution

    The display resolution or display modes of a digital television, computer monitor, or other display device is the number of distinct pixels in each dimension that can be displayed. It can be an ambiguous term especially as the displayed resolution is controlled by different factors in cathode ray tube (CRT) displays, flat-panel displays ...

  5. Elo rating system - Wikipedia

    en.wikipedia.org/wiki/Elo_rating_system

    The Elo [a] rating system is a method for calculating the relative skill levels of players in zero-sum games such as chess. It is named after its creator Arpad Elo, a Hungarian-American physics professor. The Elo system was invented as an improved chess-rating system over the previously used Harkness system, [1] but is also used as a rating ...

  6. Erdős number - Wikipedia

    en.wikipedia.org/wiki/Erdős_number

    The Erdős number ( Hungarian: [ˈɛrdøːʃ]) describes the "collaborative distance" between mathematician Paul Erdős and another person, as measured by authorship of mathematical papers. The same principle has been applied in other fields where a particular individual has collaborated with a large and broad number of peers.

  7. Charlemagne - Wikipedia

    en.wikipedia.org/wiki/Charlemagne

    e. Charlemagne [b] ( / ˈʃɑːrləmeɪn, ˌʃɑːrləˈmeɪn / SHAR-lə-mayn, -⁠MAYN; 2 April 748 [a] – 28 January 814) was King of the Franks from 768, King of the Lombards from 774, and Emperor of what is now known as the Carolingian Empire from 800, holding these titles until his death in 814. He united most of Western and Central ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Wavenumber - Wikipedia

    en.wikipedia.org/wiki/Wavenumber

    In multidimensional systems, the wavenumber is the magnitude of the wave vector. The space of wave vectors is called reciprocal space. Wave numbers and wave vectors play an essential role in optics and the physics of wave scattering, such as X-ray diffraction, neutron diffraction, electron diffraction, and elementary particle physics.