EN
For a one-to-one self-conformal contractive system ${w_{j}}_{j=1}^{m}$ on $ℝ^{d}$ with attractor K and conformality dimension α, Peres et al. showed that the open set condition and strong open set condition are both equivalent to $0 < ℋ^{α}(K) < ∞$. We give a simple proof of this result as well as discuss some further properties related to the separation condition.