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Quantitative approximation by shift invariant multivariate sublinear-Choquet operators

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Published/Copyright: November 6, 2018

Abstract

A very general multivariate positive sublinear Choquet integral type operator is given through a convolution-like iteration of another multivariate general positive sublinear operator with a multivariate scaling type function. For it, sufficient conditions are given for shift invariance, preservation of global smoothness, convergence to the unit with rates. Furthermore, two examples of very general multivariate specialized operators are presented fulfilling all the above properties; the higher order of multivariate approximation of these operators is also studied.

A Appendix

Let fCU(d,+), and let the multivariate positive sublinear-Choquet operator

(K(f))(x):-(C)[-a,a]df(x+u)φ(u)dμ(u)for allx.

We observe (for any x,yd)

|(K(f))(x)-(K(f))(y)|=|(C)[-a,a]df(x+u)φ(u)dμ(u)-(C)[-a,a]df(y+u)φ(u)dμ(u)|(3.5)(C)[-a,a]d|f(x+u)-f(y+u)|φ(u)dμ(u)ω1(f,x-y)((C)[-a,a]dφ(u)dμ(u))=(3.2)ω1(f,x-y)1=ω1(f,x-y).

Therefore, it holds the multivariate global smoothness preservation property

ω1(K(f),δ)ω1(f,δ)for allδ>0.

References

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Received: 2018-03-18
Accepted: 2018-08-13
Published Online: 2018-11-06
Published in Print: 2018-12-01

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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