Geodesic
Norm Inequalities for Ultraspherical and Hankel Conjugate Functions
Canadian journal of mathematics, Tome 27 (1975) no. 1, pp. 162-171

Voir la notice de l'article provenant de la source Cambridge University Press

The notion of conjugate functions associated with ultraspherical expansions and their continuous analogues, the Hankel transforms, was introduced by Muckenhoupt and Stein [14], to which we refer the reader for general background and an excellent discussion of the motivation underlying these notions. The operation of passing from a given function to its conjugate is in many ways analogous to the passage from a function to its Hilbert transform, indeed, Muckenhoupt and Stein proved, among other things, that these operations acting on appropriate weighted Lebesgue spaces, Lp(μ), satisfy inequalities of M. Riesz type analogous to those satisfied by the Hilbert transform on the usual Lebesgue spaces, Lv( — ∞, ∞). 
Andersen, Kenneth F. Norm Inequalities for Ultraspherical and Hankel Conjugate Functions. Canadian journal of mathematics, Tome 27 (1975) no. 1, pp. 162-171. doi: 10.4153/CJM-1975-021-7
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