EN
Let v be a standard weight on the upper half-plane 𝔾, i.e. v: 𝔾 → ]0,∞[ is continuous and satisfies v(w) = v(i Im w), w ∈ 𝔾, v(it) ≥ v(is) if t ≥ s > 0 and $lim_{t→ 0} v(it) = 0$. Put v₁(w) = Im wv(w), w ∈ 𝔾. We characterize boundedness and surjectivity of the differentiation operator D: Hv(𝔾) → Hv₁(𝔾). For example we show that D is bounded if and only if v is at most of moderate growth. We also study composition operators on Hv(𝔾).