Geodesic
Some inverse theorems for approximation of functions by Fourier--Laguerre sums
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (2010), pp. 3-9.

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In this paper we prove two inverse theorems of the approximation of functions of two variables by Fourier–Laguerre sums in a space with a certain weight.
Mots-clés : Fourier–Laguerre transform
Keywords: generalized shift operator, generalized derivatives. 
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V. A. Abilov; F. V. Abilova; M. V. Abilov. Some inverse theorems for approximation of functions by Fourier--Laguerre sums. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (2010), pp. 3-9. http://geodesic.mathdoc.fr/item/IVM_2010_9_a0/

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