Looking through the examples in ApproxFun.jl, I didn’t see one of a generalized eigenvalue problem. Is this possible? Is there a short example?

\begin{align}
a_1(V+W) + a_2 U' &= \lambda (a_3V + a_4W)\\
b_1(V'+W') &= \lambda U\\
c_1V &= \lambda W
\end{align}

where U = U(x), V = V(x), W = W(x).