Packages 
Package Description
org.hipparchus.ode
This package provides classes to solve Ordinary Differential Equations problems.
org.hipparchus.ode.events
Events
org.hipparchus.ode.nonstiff
This package provides classes to solve non-stiff Ordinary Differential Equations problems.
org.hipparchus.ode.sampling
This package provides classes to handle sampling steps during Ordinary Differential Equations integration.