Geodesic
On Laguerre expansions summability by the linear methods
Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 8 (2008) no. 1, pp. 15-20.

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This paper studies a problem of Laguerre expansions summability via methods defined by triangular matrices. The conditions on a matrix and an expandable function are obtained to guarantee the convergence of corresponding linear means at the Lebesgue point $t=0$. 
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M. D. Burmistrova. On Laguerre expansions summability by the linear methods. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, Tome 8 (2008) no. 1, pp. 15-20. http://geodesic.mathdoc.fr/item/ISU_2008_8_1_a2/

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