Differential expressions with mixed homogeneity and spaces of smooth functions they generate

S. V. Kislyakov, D. V. Maksimov, D. M. Stolyarov

Let $T_1,...,T_l$ be a collection of differential operators with constant coefficients on the torus ${\mathbb{T}}^n$. Consider the Banach space $X$ of functions $f$ on the torus fo…