Geodesic
Transformations preserving the Hankel transform
Journal of integer sequences, Tome 10 (2007) no. 7.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: We classify all polynomial transformations of integer sequences which preserve the Hankel transform, thus generalizing examples due to Layman and Spivey Steil. We also show that such transformations form a group under composition.
Keywords: Hankel transform, binomial transform 
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     author = {French, Christopher},
     title = {Transformations preserving the {Hankel} transform},
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French, Christopher. Transformations preserving the Hankel transform. Journal of integer sequences, Tome 10 (2007) no. 7. http://geodesic.mathdoc.fr/item/JIS_2007__10_7_a6/