Аңдатпа
In this paper we obtain order-sharp estimates of best N–term approximation w.r.t. the multiple (n–fold) Haar system χ(n) for the Nikol’skii – Besov and Lizorkin – Triebel type classes associated with this Haar system in the space Lr ([0, 1]n) (with 1 < r < ∞) for a number of relations between the parameters of the classes and the space.