Results 241 to 250 of about 954,644 (280)

Green’s formula for difference operators

Theoretical and Mathematical Physics, 2009
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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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Generally Unconditionally Stable Difference Operators

SIAM Journal on Numerical Analysis, 1967
u(x, 0) = uo(x), where P(D) is a partial differential operator of order p with respect to x with constant matrix coefficients. We shall study consistent difference operators of the form (2) v(x, t + k) = Eh,kv(x, t) = f(kP(ah))v(x, t), where f(z) is a rational function, h and k are the mesh-widths in x and t, respectively, and where ahV = (ah,lV, , ah ...
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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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Finite Difference Operators

1994
There are many situations in numerical analysis where we study sequences of numbers or tables of data. Much can often be gleaned from studying differences of the terms or data values.
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Psedidifferential-difference operators associated with dunkl operators

Integral Transforms and Special Functions, 2001
In this paper, we consider the Dunkl operator ⋀αof index (α+½),α≥−½ associated with the reflexion group Z2 on R. We introduce pseudodifferential-difference operators and sobolev type spaces, associated with ⋀α and using the harmonic analysis associated with ⋀α, we study some of their ...
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Difference sets and inverting the difference operator

Combinatorica, 1996
For \(A\subseteq N_0\) let \(D(A)\) be the set of differences of elements of \(A\) in \(N_0\). Problem: study equations \(D^k(X)=B\). There is a solution if \(0\in B\) and for each \(n\) there exists \(x\geq n\) such that each of the \(2^{k-1}\) intervals \([x-n, x+n]\), \([2x-n, 2x+n],\dots,[2^{k-1}x-n, 2^{k-1}x+n]\) is contained in \(B\).
Füredi, Zoltán, Jockusch, Carl G. jun., Rubel, Lee A.   +2 more
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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, Christine Zarges
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Different Compartments, Different Operation

Techniques in Knee Surgery, 2012
Thomas J. Heyse, Keith Reinhardt, Carsten O. Tibesku, David J. Mayman, Andrew D. Pearle   +4 more
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The Co-operative Difference: Co-operation among Co-operatives?

2015
In recent years, the Co-op has claimed to be the ‘Champion of Fairtrade’ in the mainstream.1 The figures go some way to support this claim: in 2011, the Co-operative Group accounted for 17.5% of all Fairtrade sales through grocery outlets and continues to achieve proportionally higher sales of Fairtrade products for the size of their business than any ...
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