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On Jan 19, 2008, at 3:28 PM, Hugh Haskell wrote:
...(I think the original discussion got
> sidetracked on changes that were not what we normally
> consider "perturbations" but altered initial conditions). . . .
In my opinion by changing initial conditions one can study the effects
of a perturbations. A perturbation is a sudden change of parameters (or
parameter), such as speed, velocity, location, mass, etc. I am thinking
about comparisons of subsequent motion without perturbations and
subsequent motion with perturbations. Is it not true that any
subsequent moment can be considered to be initial (in classical
physics)?
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Ludwik Kowalski,