Results 271 to 280 of about 5,940,643 (309)
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Lower Bounds for Column Matrix Approximations
Computational Mathematics and Mathematical Physics, 2023We show a connection between lower and upper bounds on the column matrix approximation accuracy and the bounds on the norms of the pseudoinverses of the submatrices of orthogonal matrices. This connection is exploited to derive lower bounds for column approximations accuracy in spectral and Frobenius norms.
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Generalized lower and upper approximations in a ring
Information Sciences, 2010zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Sultan Yamak +2 more
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Two Lower Estimates in Greedy Approximation
Constructive Approximation, 2003Given an arbitrary Hilbert space with a denumerable orthonormal basis, the authors construct two examples providing lower estimates for the rate of convergence of the pure Greedy algorithm and of the weak Greedy algorithm, respectively.
Livshitz, E. D., Temlyakov, V. N.
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The lower and upper approximations in a hypergroup
Information Sciences, 2008zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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On upper and lower approximative liftings
Russian Mathematical Surveys, 1985See the review in Zbl 0606.55014.
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Generalized lower and upper approximations in hyperrings
Journal of Intelligent & Fuzzy Systems, 2016The main goal of this paper is to investigate set valued homomorphisms on hyperrings and construct popularized lower and upper approximations operators via them. Also, we put forth the concept of generalized lower and upper approximations respect to a hyperideals of hyperrings.
Xiaolong Xin 0001 +2 more
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The lower and upper approximations in a fuzzy group
Information Sciences, 1996zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Nobuaki Kuroki, Paul P. Wang
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The lower and upper approximations in a multiplicative set
Journal of Intelligent & Fuzzy Systems, 2017Let S be a multiplicative subset of a commutative ring R . We considered a R × S as a universal and introduced the notion of lower[upper] approximations in a
Sinem Tarsuslu +2 more
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UPPER AND LOWER APPROXIMATIONS OF FUZZY SETS
International Journal of General Systems, 2000The upper and lower approximations of a fuzzy subset with respect to an indistinguish-ability operator are studied.
Boixader Ibáñez, Dionís +2 more
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On lower bounds in radial basis approximation
Advances in Computational Mathematics, 2005In this paper, upper bounds on the obtainable approximation orders of radial basis function approximations to approximands from Sobolev spaces are established. For this, any radial basis function of the thin-plate spline type is considered as in earlier papers, especially by Johnson, but the results are improved.
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