Equation Icon  a aˆ a ∑ lm a -- V = ∂τX = v X,a = v la + v H ,a (ξ )Ylm (ζ,ζ), (346 ) l,|m|≤l dξa dξ′a dξb va = ---, v′a = ----= Fa, b----= F a,b vb, ′ d τ dτ dτ V = KV,( ) ∑ -- = v′a ( ˆl′ + H ′lm, Y (ζ′,ζ′)) , a a lm ( l,|m |≤l ) ∑ -- = vbFa, b( ˆl′+ H ′lm, aYlm (ζ′,ζ′)) . a l,|m |≤l