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Abstract: My paper contains an error. Namely, inequality (9) does not hold. For example, for k = 2, I do not know whether the error in the argument can be corrected and whether the main result of the paper is valid. I wish to express gratitude to O. L. Vinogradov for pointing out the error. PubDate: 2018-11-01 DOI: 10.1134/S0001434618110421

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Abstract: In the text of our article, the following correction must be made: the name of the first author should be changed from S. A. Jumabaev to S. A. Jumabayev. PubDate: 2018-11-01 DOI: 10.1134/S000143461811041X

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Abstract: An ergodicity condition for the first component ηt of a controlled Poisson process without boundary is found. The Laplace transform of the same component ηt, t ≥ 0, is obtained from the given transition probabilities of the process {ηt, ξt}, t ≥ 0. It is essential that the given process {ηt, ξt}, t ≥ 0, is a Markov process homogeneous in the second component. PubDate: 2018-11-01 DOI: 10.1134/S0001434618110019

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Abstract: The discontinuity of any selection from a best n-net for n ≥ 2 in an arbitrary not strictly convex Banach space is proved. It is also proved that there is no Lipschitz selection on an arbitrary Banach space of dimension at least 2 whose unit sphere contains an attainable point of smoothness. PubDate: 2018-11-01 DOI: 10.1134/S000143461811007X

Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Abstract: Let S and T be automorphisms of a probability space whose powers S ⊗ S and T ⊗ T isomorphic. Are the automorphisms S and T isomorphičThis question of Thouvenot is well known in ergodic theory. We answer this question and generalize a result of Kulaga concerning isomorphism in the case of flows. We show that if weakly mixing flows St ⊗ St and Tt ⊗ Tt are isomorphic, then so are the flows St and Tt, provided that one of them has a weak integral limit. PubDate: 2018-11-01 DOI: 10.1134/S0001434618110330

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Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Abstract: The norm on the sum of Lorentz spaces endowed with norms equal to the products of the classical norm by some numbers is exactly calculated. The obtained result makes it possible to prove an extrapolation theorem for collections of Lorentz, Lebesgue, and Marcinkiewicz spaces with a sharp constant. PubDate: 2018-11-01 DOI: 10.1134/S0001434618110020

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Abstract: Let 1 ≤ 2l ≤ m < d. A vector x ∈ ℤd is said to be l-sparse if it has at most l nonzero coordinates. Let an m × d matrix A be given. The problem of the recovery of an l-sparse vector x ∈ Zd from the vector y = Ax ∈ Rm is considered. In the case m = 2l, we obtain necessary conditions and sufficient conditions on the numbers m, d, and k ensuring the existence of an integer matrix A all of whose elements do not exceed k in absolute value which makes it possible to reconstruct l-sparse vectors in ℤd. For a fixed m, these conditions on d differ only by a logarithmic factor depending on k. PubDate: 2018-11-01 DOI: 10.1134/S0001434618110305

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Abstract: We consider the optimal recovery problem for the solution of the Dirichlet problem for the Laplace equation in the unit d-dimensional ball on a sphere of radius ρ from a finite collection of inaccurately specified Fourier coefficients of the solution on a sphere of radius r, 0 < r < ρ < 1. The methods are required to be exact on certain subspaces of spherical harmonics. PubDate: 2018-11-01 DOI: 10.1134/S0001434618110238

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Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.

Abstract: New estimates of the sums of sine series with monotone coefficients of special classes in terms of the Salem majorant are obtained. The asymptotic sharpness of the obtained estimates for sequences of coefficients from the classes under consideration is proved. PubDate: 2018-11-01 DOI: 10.1134/S0001434618110111

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