Skip to main content
1 of 4
Carlo Beenakker
  • 188.2k
  • 18
  • 448
  • 651

An integrable hierarchy is another name for a system of commuting Hamiltonian flows.
[For the definition of a commuting flow, see for example the first part of this MO question.]

They arise from integrals of motion which are in involution (meaning that the Poisson bracket of any pair vanishes).

Carlo Beenakker
  • 188.2k
  • 18
  • 448
  • 651