Linked from
The 62 pages that link to Ordinary differential equation, each with the reason it gives.
Differential equationBroader topic: It is the single-variable case of the general concept.
Dynamical systemRelated: It specifies continuous-time evolution through the rate of change of state.
Poincaré mapRelated: Its solutions generate the continuous trajectories sampled by the map.
Brook TaylorRelated: Power-series methods use Taylor coefficients to construct local solutions.