The property $\log (f)\in BMO({\mathbb{R}}^n)$ in terms of Riesz transforms

Ioann Vasilyev

The condition mentioned in the title is equivalent to the representability of $f$ as the quotient $f=v_1/v_2$, where $v_1$ and $v_2$ obey the inequalities $|R_j{v}_i|\le C|v_i|$…