projection set

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• Projection (set theory) — In set theory, a projection is one of two closely related types of functions or operations, namely:* A set theoretic operation typified by the j th projection map, written mathrm{proj} {j}!, that takes an element vec{x} = (x 1, ldots, x j, ldots …   Wikipedia

• Projection (relational algebra) — IntroductionIn relational algebra, a projection is a unary operation written as pi {a 1, ...,a n}( R ) where a 1,...,a n is a set of attribute names. The result of such projection is defined as the set obtained when the components of the tuple R… …   Wikipedia

• Projection — Contents 1 Chemistry 2 Mathematics 3 Other 4 See also …   Wikipedia

• projection — projection, protrusion, protuberance, bulge all denote something which extends beyond a level or a normal outer surface. Projection is applicable to anything that juts out, especially at a sharp angle {buttresses are projections which serve to… …   New Dictionary of Synonyms

• set|back — «SEHT BAK», noun. 1. a check to progress; reverse: »a temporary setback in one s fortunes, an unexpected setback in a patient s recovery. SYNONYM(S): relapse, retardation. 2. a steplike setting back of the outside wall of a tall building to give… …   Useful english dictionary

• Projection (mathematics) — Commutativity of this diagram is the universality of projection π, for any map f and set X. Generally speaking, in mathematics, a projection is a mapping of a set (or of a mathematical structure) which is idempotent, which means that a projection …   Wikipedia

• Projection-valued measure — In mathematics, particularly functional analysis a projection valued measure is a function defined on certain subsets of a fixed set and whose values are self adjoint projections on a Hilbert space. Projection valued measures are used to express… …   Wikipedia

• Projection clock — A projection clock (also called ceiling clock) is an analog or digital clock equipped with a projector that creates an enlarged image of the clock face on any suitable projection screen, most often the ceiling. They are not very complex, and can… …   Wikipedia

• Settegast projection — Set·te·gast projection (setґə gahst) [H. Settegast, German radiologist, 20th century] see under projection …   Medical dictionary

• set design —    Design jobs in the performing arts include theatre designer, stage designer and, increasingly the European term ‘scenographer’ (with sub categories of set designer, costume designer, lighting designer and sound designer). Taken together, these …   Encyclopedia of contemporary British culture

• set up — Synonyms and related words: abet, aggrandize, aggravate, aid, amend, angel, animate, annoy, apotheose, apotheosize, arouse, arrange, array, assemble, assist, author, avail, back, bail out, bankroll, base, bear, bear a hand, beatify, befriend,… …   Moby Thesaurus