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  2. Feynman diagram - Wikipedia

    en.wikipedia.org/wiki/Feynman_diagram

    The quadratic form defining the propagator is non-invertible. The reason is the gauge invariance of the field; adding a gradient to A does not change the physics. To fix this problem, one needs to fix a gauge. The most convenient way is to demand that the divergence of A is some function f, whose value is random from point to point.

  3. Ink wash painting - Wikipedia

    en.wikipedia.org/wiki/Ink_wash_painting

    His style was realistic rather than abstract, [91] and he additionally is credited with advancing the ink-wash artform towards a more uniquely Korean direction. [79] His works include ink and oriental water paintings, such as Inwangjesaekdo (1751), Geumgang jeondo (1734), and Ingokjeongsa (1742), as well as numerous "true-view" landscape ...

  4. Grand Theft Auto VI - Wikipedia

    en.wikipedia.org/wiki/Grand_Theft_Auto_VI

    Grand Theft Auto VI is set in the fictional open world state of Leonida—based on Florida—which includes Vice City, a fictionalised version of Miami. [1] [2] [3] Vice City was previously featured in Grand Theft Auto (1997) and as the main setting of Grand Theft Auto: Vice City (2002) and Grand Theft Auto: Vice City Stories (2006).

  5. Saint Basil's Cathedral - Wikipedia

    en.wikipedia.org/wiki/Saint_Basil's_Cathedral

    The abstract allegory was reinforced by real-life religious rituals where the church played the role of the biblical Temple in Jerusalem: The capital city, Moscow, is split into three parts; the first of them, called Kitai-gorod, is encircled with a solid thick wall. It contains an extraordinary beautiful church, all clad in shiny bright gems ...

  6. Tesla coil - Wikipedia

    en.wikipedia.org/wiki/Tesla_coil

    A Tesla coil is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. [1] It is used to produce high-voltage, low-current, high-frequency alternating-current electricity.