Equation Icon  h(n,m) = ∑ ˆA(n,m)ˆωL, (22.13 ) tt L ℓ∑≥0 ∑ [ ] h(n,m) = ˆB (n,m)ˆω L + ˆC (n,m)ˆωL− 1 + 𝜖 c ˆD (n,m)ˆωbL−1 , (22.14 ) ta L a aL− 1 ab cL− 1 ℓ≥0∑ ℓ≥1∑ ∑ [ ] h(n,m) = δab ˆK (n,m)ˆωL + Eˆ(n,m)ˆωabL + Fˆ(n,m )ˆωb⟩L− 1 + 𝜖cd(aωˆb )cL−1Gˆ(n,m ) ab ℓ≥0 L ℓ≥0 L ℓ≥1 L−1⟨a dL−1 ∑ [ ] + Hˆ(anb,mL−)2ˆωL −2 + 𝜖cd(aˆI(nb),dmL)−2ˆωcL− 2 . (22.15 ) ℓ≥2