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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of computational analysis and applications 2 (2000), S. 309-322 
    ISSN: 1572-9206
    Keywords: Hermite interpolation ; conditionally positive definiteness ; spherical harmonics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we give a lower bound for the least eigenvalue of theinterpolation matrix arising from Hermite interpolation by positive definitekernel on sphere $$S^{d - 1} $$ , determining the main factor for stabilityof interpolation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Constructive approximation 14 (1998), S. 169-185 
    ISSN: 1432-0940
    Keywords: Key words. Multiplier operator, n -Width, Levy mean, Measure. AMS Classification. 41A25, 41A46, 42A45, 47B06. 〈lsiheader〉 〈onlinepub〉8 May, 1998 〈editor〉Editors-in-Chief: &lsilt;a href=../edboard.html#chiefs&lsigt;R.A. DeVore, E.B. Saff&lsilt;/a&lsigt; 〈pdfname〉14n2p169.pdf 〈pdfexist〉yes 〈htmlexist〉no 〈htmlfexist〉no 〈texexist〉yes 〈sectionname〉 〈/lsiheader〉
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. The asymptotic behavior of the n -widths of multiplier operators from L p [0,1] into L q [0,1] is studied. General upper and lower bounds for the n -widths in terms of the multipliers are established. Moreover, it is shown that these upper and lower bounds coincide for some important concrete examples.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Constructive approximation 15 (1999), S. 369-379 
    ISSN: 1432-0940
    Keywords: Key words. Fourier—Gegenbauer projection, Lebesgue constants. AMS Classification. 42A24, 42C10.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We extend the results of Pollard [4] and give asymptotic estimates for the norm of the Fourier—Gegenbauer projection operator in the appropriate weighted L p space. In particular, we settle the question of whether the projection is bounded for p=(2λ+1)/λ and p=(2λ+1)/(λ+1) , where λ is the index for the family of Gegenbauer polynomials under consideration.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Numerical algorithms 10 (1995), S. 401-419 
    ISSN: 1572-9265
    Keywords: Radial basis functions ; thin-plate splines ; convolution kernels ; 41A30 ; 41A63
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Quasi-interpolation using radial basis functions has become a popular method for constructing approximations to continuous functions in many space dimensions. In this paper we discuss a procedure for generating kernels for quasi-interpolation, using functions which have series expansions involving terms liker α logr. It is shown that such functions are suitable if and only if α is a positive even integer and the spatial dimension is also even.
    Type of Medium: Electronic Resource
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