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Found 20,107 Documents (Results 801–900)

Chebyshev approximation of multivariable functions by the exponential expression. (English. Ukrainian original) Zbl 1470.41031

Cybern. Syst. Anal. 57, No. 3, 429-435 (2021); translation from Kibern. Sist. Anal. 57, No. 3, 106-113 (2021).
MSC:  41A63 41A10 65D15
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Exact estimates of the probability of a non-negative unimodal random value hitting special intervals under incomplete information. (English. Russian original) Zbl 1472.60040

Cybern. Syst. Anal. 57, No. 2, 264-267 (2021); translation from Kibern. Sist. Anal. 57, No. 2, 110-114 (2021).
MSC:  60E15 94A15
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Method of orthogonal polynomials for an approximate solution of singular integro-differential equations as applied to two-dimensional diffraction problems. (English. Russian original) Zbl 1491.45016

Differ. Equ. 57, No. 6, 814-823 (2021); translation from Differ. Uravn. 57, No. 6, 830-839 (2021).
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Monotone path-connectedness of Chebyshev sets in three-dimensional spaces. (English. Russian original) Zbl 1472.41019

Sb. Math. 212, No. 5, 636-654 (2021); translation from Mat. Sb. 212, No. 5, 37-57 (2021).
MSC:  41A65 41A50 46A55
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From operator theory to orthogonal polynomials, combinatorics, and number theory. A volume in honor of Lance Littlejohn’s 70th birthday. (English) Zbl 1479.47003

Operator Theory: Advances and Applications 285. Cham: Birkhäuser (ISBN 978-3-030-75424-2/hbk; 978-3-030-75425-9/ebook). xiv, 382 p. (2021).
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A Chebyshev-type theorem characterizing best approximation of a continuous function by elements of the sum of two algebras. (English. Russian original) Zbl 1468.41011

Math. Notes 109, No. 1, 15-20 (2021); translation from Mat. Zametki 109, No. 1, 19-26 (2021).
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