A sufficient condition for Haar multipliers in Triebel-Lizorkin spaces

Gustavo Garrigós, Andreas Seeger, Tino Ullrich

We consider Haar multiplier operators $T_m$ acting on Sobolev spaces, and more generally Triebel-Lizorkin spaces $F_{p,q}^s(\mathbb{R})$, for indices in which the Haar system is no…