Results 231 to 240 of about 227,508 (263)

On Unimodular Matrices of Difference Operators

2018
We consider matrices \(L \in \mathrm{Mat} _n(K[\sigma , \sigma ^{-1}])\) of scalar difference operators, where K is a difference field of characteristic 0 with an automorphism \(\sigma \). We discuss approaches to compute the dimension of the space of those solutions of the system of equations \(L(y)=0\) that belong to an adequate extension of K.
Sergei A. Abramov, Denis E. Khmelnov
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Operator-Difference Scheme with a Factorized Operator

2015
In the study of difference schemes for time-dependent problems of mathematical physics, the general theory of stability (well-posedness) for operator-difference schemes is in common use. At the present time, the exact (matching necessary and sufficient) conditions for stability are obtained for a wide class of two- and three-level difference schemes ...
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Comparing Different Aging Operators

2009
Quite different search heuristics make use of the concept of assigning an age to search points and systematically remove search points that are too old from the search process. In evolutionary computation one defines some finite maximal lifespan and assigns age 0 to each new search point. In artificial immune systems static pure aging is used.
Thomas Jansen 0001, Christine Zarges
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Green’s formula for difference operators

Theoretical and Mathematical Physics, 2009
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Inverse Linear Difference Operators

Computational Mathematics and Mathematical Physics, 2017
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Difference Analog of the Lamé Operator

Proceedings of the Steklov Institute of Mathematics
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Mauleshova, G. S., Mironov, A. E.
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Peak Detection Using Difference Operators

IEEE Transactions on Pattern Analysis and Machine Intelligence, 1979
Complex waveforms may contain peaks and valleys at many different scales, ranging from very local to very global. This correspondence describes an approach to detecting these peaks and valleys by applying simple difference operators at each point to neighborhoods having a wide range of sizes, and making simple comparisons of the outputs of these ...
Jan-Olof Eklundh, Azriel Rosenfeld
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On Generalized Powers of the Difference Operator

Canadian Journal of Mathematics, 1965
Sumner (3) discussed for arbitrary real λ and h, where the averaging operator ∇h is defined by(1.1)when f(z) is an entire function of exponential type <2π/|h|. Boas (2) gave an alternative definition of ∇h which gave Sumner's results quickly and showed that his definition is equivalent to that of Sumner.
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Sex Differences in Formal Operations

The Journal of Psychology, 1993
Research relating cognitive development to gender has been rather limited. The few studies that have explored such a relationship have been conclusive. The object of this study was to explore whether African students' performance on formal operations measure would be related to whether they were male or female.
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On higher-order difference operators

Journal of Difference Equations and Applications, 1995
For fixed p, q ≥ 1 we consider the equation (1) where y = [y v ] v≥0 and a vj ∈ ℂ are complex numbers. The operator L is called non-degenerate if a vp ≠ 0, v ≥q. In this article we define the Weyl matrix for L, establish its properties, and consider the inverse problem of determining L from its Weyl matrix. We obtain an algorithm of solving,
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