Linked from
The 13 pages that link to Lyapunov exponent, each with the reason it gives.
Phase spaceRelated: It quantifies sensitivity to initial points in phase space.
Poincaré mapRelated: The map’s iterates can estimate instability that the exponent quantifies.
Artur AvilaRelated: Lyapunov exponents help characterize the dynamical regimes in Avila’s work.
Edge of chaosRelated: Its value helps distinguish stable dynamics from sensitive, chaotic ones.