Long-time asymptotics from a Laplace transform
= Long-time asymptotics from a Laplace transform
Terms singular at $s=0$ in a <Laplace transform> encode persistent late-time behaviour. In particular,
$$
F(s)=\frac{A}{s^2}+\frac{B}{s}+O(1)
$$
contributes $At+B$ to the inverse transform; singularities farther into the left half-plane contribute decaying terms under the usual analyticity and growth assumptions.