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  2. List of Internet top-level domains - Wikipedia

    en.wikipedia.org/wiki/List_of_Internet_top-level...

    This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet. A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database. [1]

  3. Torus - Wikipedia

    en.wikipedia.org/wiki/Torus

    Poloidal direction (red arrow) and toroidal direction (blue arrow) A torus can be parametrized as: [2] (,) = (+ ⁡) ⁡ (,) = (+ ⁡) ⁡ (,) = ⁡. using angular coordinates , [,), representing rotation around the tube and rotation around the torus' axis of revolution, respectively, where the major radius is the distance from the center of the tube to the center of the torus and the minor ...

  4. List of Olympic Games host cities - Wikipedia

    en.wikipedia.org/wiki/List_of_Olympic_Games_host...

    There was a change in host selection process in the late 2010s to address several problems – including the costs of hosting and the disappointment felt by unsuccessful applicants. Called Olympic Agenda 2020 , [ 7 ] this new process is focused on reducing the cost of Games, minimising wasteful single-use construction projects and increasing ...

  5. Angular momentum - Wikipedia

    en.wikipedia.org/wiki/Angular_momentum

    There is then an associated action of the Lie algebra so(3) of SO(3); the operators describing the action of so(3) on our Hilbert space are the (total) angular momentum operators. The relationship between the angular momentum operator and the rotation operators is the same as the relationship between Lie algebras and Lie groups in

  6. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    The ANSI alphabetic state code is the same as the USPS state code except for U.S. Minor Outlying Islands, which have an ANSI code "UM" but no USPS code—and U.S. Military Mail locations, which have USPS codes ("AA", "AE", "AP") but no ANSI code.

  7. Displacement operator - Wikipedia

    en.wikipedia.org/wiki/Displacement_operator

    In the quantum mechanics study of optical phase space, the displacement operator for one mode is the shift operator in quantum optics, ^ = ⁡ (^ † ^), where is the amount of displacement in optical phase space, is the complex conjugate of that displacement, and ^ and ^ † are the lowering and raising operators, respectively.

  8. List of dialling codes in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/List_of_dialling_codes_in...

    0895 later used for Premium rate numbers; changed from 0895 to 09xx on 28 April 2001. 01896 — Galashiels, Tweed (TW6) 0896 later used for Premium rate numbers; changed from 0896 to 09xx on 28 April 2001. 01897 — unused; 0897 was never used as an area code 0897 later used for BT Premium rate numbers; changed from 0897 to 09xx on 28 April 2001

  9. List of FIFA World Cup finals - Wikipedia

    en.wikipedia.org/wiki/List_of_FIFA_World_Cup_finals

    Results by nation Team Winners Runners-up Total finals Years won Years runners-up Brazil 5 2 7 1958, 1962, 1970, 1994, 2002: 1950, 1998 Germany 4 4 8 1954, 1974, 1990, 2014