Abstract
Necessary conditions under which shift systems of refinable functions are orthogonal, or Riesz systems on Vilenkin groups and local fields of positive characteristic, are well known. These conditions are expressed in terms of a mask. We indicate a class of refinable functions for which these conditions are necessary and sufficient.
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This work was supported by SEMC “Mathematics of Future Technologies”.
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Berdnikov, G.S., Lukomskii, S.F. Discrete orthogonal and Riesz refinable functions on local fields of positive characteristic. European Journal of Mathematics 6, 1505–1522 (2020). https://doi.org/10.1007/s40879-020-00420-1
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DOI: https://doi.org/10.1007/s40879-020-00420-1