Ultraspherical multipliers revisited
Authors: George Gasper and Walter Trebels
Abstract:
Sufficient ultraspherical multiplier criteria are refined in such a way
that they are comparable with necessary multiplier conditions. Also
new necessary conditions for Jacobi multipliers are deduced which, in
particular, imply known Cohen type inequalities. Muckenhoupt's
transplantation theorem is used in an essential way.
This article to appear in
Acta Sci. Math. (Szeged)
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