Equation Icon  θ[αA] = − αA for A = 1,⋅⋅⋅ ,2q, θ [α ] = − α − 2(α + ⋅⋅⋅ + α ), 2q+1 2q+1 2q+2 q+p θ[αA] = + αA for A = 2q + 2, ⋅⋅⋅ ,q + p.