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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… 
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Papers overview

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2006
2006
  • R. Orsi
  • SIAM J. Matrix Anal. Appl.
  • 2006
  • Corpus ID: 11033543
Presented here are two related numerical methods, one for the inverse eigenvalue problem for nonnegative or stochastic matrices… 
Highly Cited
2005
Highly Cited
2005
Design procedures are proposed for two different classes of observers for systems withunknown inputs. In thefirst approach, the… 
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… 
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… 
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… 
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… 
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… 
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… 
Highly Cited
1983
Highly Cited
1983
The generating functions and mean displacements of various two-dimensional directed self-avoiding walk models are calculated…