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Projection (relational algebra)

Known as: Projection, Projection (database), Projection in relational algebra 
In relational algebra, a projection is a unary operation written as where is a set of attribute names. The result of such projection is defined as… Expand
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Papers overview

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Highly Cited
2005
Highly Cited
2005
Design procedures are proposed for two different classes of observers for systems withunknown inputs. In thefirst approach, the… Expand
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2005
2005
0.1. Interpolation. Let (Ω, μ) be a measure space. Consider an operator Q that acts in all spaces L(μ) with 1 < p < ∞ and is a… Expand
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2005
2005
Classical results of Kalton are used to study the complementation of the space W(X, Y) of weakly compact operators and the space… Expand
2000
2000
A set A C R 2 is called invisible, if its orthogonal projection is of measure 0 in almost every direction; A is visible, if it is… Expand
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Highly Cited
1999
Highly Cited
1999
Resolution is an often used method for deduction in propositional logic. Here a proper organization of deduction is proposed… Expand
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Highly Cited
1998
Highly Cited
1998
A self-constructing neural fuzzy inference network (SONFIN) with online learning ability is proposed in this paper. The SONFIN is… Expand
Highly Cited
1990
Highly Cited
1990
  • H. Hong
  • ISSAC '90
  • 1990
  • Corpus ID: 2395518
The Cylindrical Algebraic Decomposition (CAD) method of Collins [5] decomposes <italic>r</italic>-dimensional Euclidean space… Expand
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Highly Cited
1988
Highly Cited
1988
A key component of the cylindrical algebraic decomposition (cad) algorithm of Collins (1975) is the projection operation: the… Expand
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Highly Cited
1987
Highly Cited
1987
We present a series of operators of apparently increasing power which when added to first-order logic produce a series of… Expand
Highly Cited
1983
Highly Cited
1983
The generating functions and mean displacements of various two-dimensional directed self-avoiding walk models are calculated… Expand
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