Projection

Look up projection, projecting, projective, or projector in Wiktionary, the free dictionary.

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

• All pages with titles beginning with Projection
• All pages with titles containing Projection
• Project (disambiguation)
• Projection effect (disambiguation)
• Projector (disambiguation)
• Projective (disambiguation)

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