009J Lemma 2.4. (Comparison principle)[30, Thm. 2.1] If uu and vv are ω\omega-psh on YY, then on Ω={u<v}\Omega=\{u<v\}, we have ∫Ωωun≥∫Ωωvn.\int_{\Omega}\omega_{u}^{n}\geq\int_{\Omega}\omega_{v}^{n}.