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  2. Inversive geometry - Wikipedia

    en.wikipedia.org/wiki/Inversive_geometry

    This is called circle inversion or plane inversion. The inversion taking any point P (other than O ) to its image P ' also takes P ' back to P , so the result of applying the same inversion twice is the identity transformation which makes it a self-inversion (i.e. an involution).

  3. List of Ohio area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Ohio_area_codes

    In 2015, area code 740 was overlaid with 220, relieving its rapid depletion. In 2016, area code 614 was overlaid with 380 in the Columbus/Central Ohio area for the same reason. In 2020, 326 was added as an all services overlay for 937. Area code 283 was added as an overlay for 513 on April 28, 2023.

  4. 121st Air Refueling Wing - Wikipedia

    en.wikipedia.org/wiki/121st_Air_Refueling_Wing

    In 1959, the need for active duty Air Defense Command bases and regular Air Force fighter-interceptor operations were diminishing and the intent to scale back operations at Youngstown AFB was announced on 28 October 1959. The Ohio Air National Guard moved the 121st FBG back to Lockbourne Air Force Base on 1 March 1960.

  5. Fourier inversion theorem - Wikipedia

    en.wikipedia.org/wiki/Fourier_inversion_theorem

    The Fourier inversion theorem holds for all Schwartz functions (roughly speaking, smooth functions that decay quickly and whose derivatives all decay quickly). This condition has the benefit that it is an elementary direct statement about the function (as opposed to imposing a condition on its Fourier transform), and the integral that defines ...

  6. Inversion (discrete mathematics) - Wikipedia

    en.wikipedia.org/wiki/Inversion_(discrete...

    An inversion may be denoted by the pair of places (2, 4) or the pair of elements (5, 2). The inversions of this permutation using element-based notation are: (3, 1), (3, 2), (5, 1), (5, 2), and (5,4). In computer science and discrete mathematics, an inversion in a sequence is a pair of elements that are out of their natural order.

  7. 164th Airlift Squadron - Wikipedia

    en.wikipedia.org/wiki/164th_Airlift_Squadron

    The wartime 363d Fighter Squadron was re-designated as the 164th Fighter Squadron, and was allotted to the Ohio Air National Guard, on 24 May 1946.It was organized at Mansfield Lahm Regional Airport, Ohio, and was extended federal recognition on 20 June 1948 by the National Guard Bureau.