Projection
Projection, projections or projective may refer to:
Physics
- Projection (physics), the action/process of light, heat, or sound reflecting from a surface to another in a different direction
- The display of images by a projector
Optics, graphics, and cartography
- Map projection, reducing the surface of a three-dimensional planet to a flat map
- Graphical projection, the production of a two-dimensional image of a three-dimensional object
Chemistry
- Fischer projection, a two-dimensional representation of a three-dimensional organic molecule
- Haworth projection, a way of writing a structural formula to represent the cyclic structure of monosaccharides
- Natta projection, a way to depict molecules with complete stereochemistry in two dimensions in a skeletal formula
- Newman projection, a visual representation of a chemical bond from front to back
Mathematics
- Projection (mathematics), any of several different types of geometrical mappings
- Projection (linear algebra), a linear transformation P from a vector space to itself such that P2 = P
- Projection (set theory), one of two closely related types of functions or operations in set theory
- Projection (measure theory), use of a projection map in measure theory
- 3D projection, any method of mapping three-dimensional points to a two-dimensional plane
- Vector projection, orthogonal projection of a vector onto a straight line
- Projection (relational algebra), a type of unary operation in relational algebra
- Projective geometry, the study of geometric properties that are invariant with respect to projective transformations
- Projective module, a generalization of a free module
- Projective object, a further generalization, in category theory
- Projection method (fluid dynamics), means of numerically solving time-dependent incompressible fluid-flow problems
Biology
- Projection areas, areas of the brain where sensory processing occurs
- Projection fiber, in neuroscience, white matter fibers that connect the cortex to the lower parts of the brain or the spinal cord
Linguistics
- Projection (linguistics), grammatical trait inheritance from a head to a phrasal category
- Projection principle in syntax
- Projection of presuppositions in linguistics
Arts and entertainment
- "Projections" (Star Trek: Voyager), an episode of the television series Star Trek: Voyager
- Projections (The Blues Project album), 1966
- Projections (John Handy album), 1968
- Projections (film), 2013 Croatian film
Other uses
- Projection (alchemy), process in Alchemy
- Projections (journal), an interdisciplinary academic journal related to cinema and visual media
- Power projection, the capacity of a state to implement policy by means of force, or the threat thereof
- Psychological projection, or "Freudian projection", a defense mechanism in which one attributes to others one's own unacceptable or unwanted attributes, thoughts, or emotions
- Social projection, a cognitive bias that leads people to believe others are similar to themselves
- Forecasting, making predictions of the future based on past and present data
- Population projection, in the field of demography, an estimate of a future population
See also
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