3 papers
math.CA2007
The Kadets 1/4 theorem for polynomials
J. Marzo, K. Seip
We determine the maximal angular perturbation of the (n+1)th roots of unity permissible in the Marcinkiewicz-Zygmund theorem on L^p means of polynomials of degree at most n. For p=…
math.FA2006
Marcinkiewicz-Zygmund inequalities and interpolation by spherical harmonics
Jordi Marzo
We find necessary density conditions for Marcinkiewicz-Zygmund inequalities and interpolation for spaces of spherical harmonics with respect to the L^p norm. Moreover, we prove tha…
math.FA2006
Riesz basis of exponentials for a union of cubes in R^{d}
Jordi Marzo
We extend to several dimensions the result of K. Seip and Y.I. Lyubarskii that proves the existence of Riesz basis of exponentials for a finite union of intervals with equals lengt…