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  2. KV9 - Wikipedia

    en.wikipedia.org/wiki/KV9

    Tomb KV9 in Egypt's Valley of the Kings was originally constructed by Pharaoh Ramesses V. He was interred here, but his uncle, Ramesses VI , later reused the tomb as his own. The architectural layout is typical of the 20th Dynasty – the Ramesside period – and is much simpler than that of Ramesses III 's tomb ( KV11 ).

  3. List of countries by tax rates - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_tax_rates

    62% (This consists of 40% income tax on the GBP 100k–125k band, an effective 20% due to the phase-out of the personal allowance, and 2% employee National Insurance). The marginal rate then drops to 47% for income above GBP 125k (45% income tax plus 2% employee National Insurance) [242] [243] 20% (standard rate) 5% (home energy and renovations)

  4. List of coordinate charts - Wikipedia

    en.wikipedia.org/wiki/List_of_coordinate_charts

    Coordinate charts are mathematical objects of topological manifolds, and they have multiple applications in theoretical and applied mathematics. When a differentiable structure and a metric are defined, greater structure exists, and this allows the definition of constructs such as integration and geodesics .

  5. List of common coordinate transformations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_coordinate...

    Let (x, y, z) be the standard Cartesian coordinates, and (ρ, θ, φ) the spherical coordinates, with θ the angle measured away from the +Z axis (as , see conventions in spherical coordinates). As φ has a range of 360° the same considerations as in polar (2 dimensional) coordinates apply whenever an arctangent of it is taken. θ has a range ...

  6. Atlas (topology) - Wikipedia

    en.wikipedia.org/wiki/Atlas_(topology)

    When a coordinate system is chosen in the Euclidean space, this defines coordinates on : the coordinates of a point of are defined as the coordinates of (). The pair formed by a chart and such a coordinate system is called a local coordinate system , coordinate chart , coordinate patch , coordinate map , or local frame .

  7. Del in cylindrical and spherical coordinates - Wikipedia

    en.wikipedia.org/wiki/Del_in_cylindrical_and...

    This article uses the standard notation ISO 80000-2, which supersedes ISO 31-11, for spherical coordinates (other sources may reverse the definitions of θ and φ): . The polar angle is denoted by [,]: it is the angle between the z-axis and the radial vector connecting the origin to the point in question.

  8. Orthogonal coordinates - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_coordinates

    A conformal map acting on a rectangular grid. Note that the orthogonality of the curved grid is retained. While vector operations and physical laws are normally easiest to derive in Cartesian coordinates, non-Cartesian orthogonal coordinates are often used instead for the solution of various problems, especially boundary value problems, such as those arising in field theories of quantum ...

  9. Normal coordinates - Wikipedia

    en.wikipedia.org/wiki/Normal_coordinates

    These are the coordinates on M obtained by introducing the standard spherical coordinate system on the Euclidean space T p M. That is, one introduces on T p M the standard spherical coordinate system (r,φ) where r ≥ 0 is the radial parameter and φ = (φ 1,...,φ n−1) is a parameterization of the (n−1)-sphere.