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The word projection has several uses.
- In cartography, a map projection
- In psychology, psychological projection
- In neuroscience, the outputs from a neuron to other neurons.
- 3D projection, orthographic projection, oblique projection, and isometric projection are ways of representing 3D scenes in 2D; see graphical projection.
- In mathematics a projection is a linear transformation which remains unchanged if applied twice (p(u) = p(p(u))) (in other words, it is idempotent), such as that taking (x, y, z) in three dimensions to (x, y, 0) in the plane or generalisations of this in other dimensions. See orthogonal projection, projection (linear algebra), projection operator.
- In mathematics a projection is also a mapping that takes an element to the equivalence class it is in, and mapping an element (x,y) of a Cartesian product to x or y, mapping a function f to the value f (x ) for a fixed x, etc.
- In cinematography, projection is the display of a movie in a theater using a movie projector, which is likely to be replaced by digital projection
- In military strategy and international relations, projection of force refers to the latent or actualized capacity to win armed contests in distant theatres.
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