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  1. # VOLTERRA.ODE
  2. # Volterra predator-prey equations
  3. # See any book on population dynamics
  4. # There is a limit cycle.
  5.  
  6. $t 20
  7.  
  8.  
  9. x  = 1
  10. y  = 2
  11. x' = (1-y)*x
  12. y' = (x-1)*y
  13.