EN
This paper deals with function spaces of varying smoothness $B^{𝕊,s₀}_p(ℝⁿ)$, where the function 𝕊:x ↦ s(x) determines the smoothness pointwise. Those spaces were defined in [2] and treated also in [3]. Here we prove results about interpolation, trace properties and present a characterization of these spaces based on differences.