Computing in the past with forward integration

C. W. Gear, Ioannis G. Kevrekidis

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Using existing, forward-in-time integration schemes, we demonstrate that under certain conditions it is possible to compute the solution at earlier times, even in the presence of stiffness (for which reverse integration is unstable). This technique can be used when a reverse integrator is not available - for example, when all one has is a forward-in-time legacy code. It can also be used for the "reverse coarse" integration of the macroscopic closure of a system defined by a microscopic model which itself is naturally forward in time (e.g., a particle model of a gas). The method proposed has stability properties that enable it to converge to stationary points of unstable stiff systems.

Original languageEnglish (US)
Pages (from-to)335-343
Number of pages9
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number5-6
StatePublished - Feb 16 2004

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


  • Differential equations
  • Reverse integration
  • Stationary points


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