Laplace coefficient
= Laplace coefficient
{c}
{title2=$b_s^{(j)}(\alpha)$}
A Laplace coefficient is the Fourier coefficient
$$
b_s^{(j)}(\alpha)=\frac1\pi\int_0^{2\pi}
\frac{\cos(j\psi)\,d\psi}{(1-2\alpha\cos\psi+\alpha^2)^s}.
$$
It packages the radial dependence of a disturbing-function expansion.