Geodesic
Dependence of the Convergence Domain of Spectral Expansions on the Geometry of the Set of Discontinuity of the Function Being Expanded
Matematičeskie zametki, Tome 79 (2006) no. 2, pp. 178-193

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For piecewise smooth functions, we indicate their domains of convergence and Riecz summarizability of their spectral expansions related to the Laplace operator in $\mathbb R^n$, depending on the geometry of points of discontinuity of the function being expanded. 
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     author = {Sh. A. Alimov},
     title = {Dependence of the {Convergence} {Domain} of {Spectral} {Expansions} on the {Geometry} of the {Set} of {Discontinuity} of the {Function} {Being} {Expanded}},
     journal = {Matemati\v{c}eskie zametki},
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Sh. A. Alimov. Dependence of the Convergence Domain of Spectral Expansions on the Geometry of the Set of Discontinuity of the Function Being Expanded. Matematičeskie zametki, Tome 79 (2006) no. 2, pp. 178-193. http://geodesic.mathdoc.fr/item/MZM_2006_79_2_a2/