Proposition ·The weights i +ta tan2 ai 02 06 0i= llvi -voll are the valid weights. 02 00 Proof:substitution.?? Come from the mean value theorem for harmonic functions.?? 03 Proposition • The weights 𝜆𝑖 = 𝜔𝑖 𝑖=1 𝑘 𝜔𝑖 , 𝜔𝑖 = tan 𝛼𝑖−1 2 + tan 𝛼𝑖 2 𝑣𝑖 − 𝑣0 are the valid weights. Proof: substitution. ??? Come from the mean value theorem for harmonic functions. ??? 𝑣0 𝑣3 𝑣2 𝑣1 𝑣4 𝑣5 𝑣6 𝛼1 𝛽1 𝛾1 𝛽2 𝛾2 𝛼2