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Projection - Wikipedia, the free encyclopedia |
 | | 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. |
 | | 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 |
| en.wikipedia.org /wiki/Projection (246 words) |
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