Equation Icon  2 𝜀H (1)(&tidle;s) = sH (0,1)+ 𝜀H (1,0)+ 𝜀-H (2,−1)+ O(𝜀3∕s2), (22.8 ) αβ αβ αβ s αβ 𝜀2H (2)(&tidle;s) = s2H (0,2)+ 𝜀sH (1,1)+ 𝜀2H (2,0) + 𝜀2lnsH (2,0,ln)+ O (𝜀3∕s), (22.9 ) α(β3) αβ αβ αβ αβ 𝜀3H αβ(&tidle;s) = O (𝜀3,𝜀2s,𝜀s2,s3), (22.10 )