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  2. Vector projection - Wikipedia

    en.wikipedia.org/wiki/Vector_projection

    where the operator ⋅ denotes a dot product, ‖a‖ is the length of a, and θ is the angle between a and b.The scalar projection is equal in absolute value to the length of the vector projection, with a minus sign if the direction of the projection is opposite to the direction of b, that is, if the angle between the vectors is more than 90 degrees.

  3. Projection formula - Wikipedia

    en.wikipedia.org/wiki/Projection_formula

    Projection formula. In algebraic geometry, the projection formula states the following: [1] [2] For a morphism of ringed spaces, an -module and a locally free -module of finite rank, the natural maps of sheaves. are isomorphisms. There is yet another projection formula in the setting of étale cohomology .

  4. Stereographic projection - Wikipedia

    en.wikipedia.org/wiki/Stereographic_projection

    In mathematics, a stereographic projection is a perspective projection of the sphere, through a specific point on the sphere (the pole or center of projection ), onto a plane (the projection plane) perpendicular to the diameter through the point. It is a smooth, bijective function from the entire sphere except the center of projection to the ...

  5. Projection (linear algebra) - Wikipedia

    en.wikipedia.org/wiki/Projection_(linear_algebra)

    In linear algebra and functional analysis, a projection is a linear transformation from a vector space to itself (an endomorphism) such that . That is, whenever is applied twice to any vector, it gives the same result as if it were applied once (i.e. is idempotent ). It leaves its image unchanged. [1]

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  7. Multiview orthographic projection - Wikipedia

    en.wikipedia.org/wiki/Multiview_orthographic...

    In technical drawing and computer graphics, a multiview projection is a technique of illustration by which a standardized series of orthographic two-dimensional pictures are constructed to represent the form of a three-dimensional object. Up to six pictures of an object are produced (called primary views ), with each projection plane parallel ...

  8. Projection matrix - Wikipedia

    en.wikipedia.org/wiki/Projection_matrix

    In statistics, the projection matrix , [1] sometimes also called the influence matrix [2] or hat matrix , maps the vector of response values (dependent variable values) to the vector of fitted values (or predicted values). It describes the influence each response value has on each fitted value. [3] [4] The diagonal elements of the projection ...

  9. Orthographic map projection - Wikipedia

    en.wikipedia.org/wiki/Orthographic_map_projection

    Like the stereographic projection and gnomonic projection, orthographic projection is a perspective (or azimuthal) projection in which the sphere is projected onto a tangent plane or secant plane. The point of perspective for the orthographic projection is at infinite distance. It depicts a hemisphere of the globe as it appears from outer space ...

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