Talk:N-body simulation

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"One of the simplest refinements is that each particle carries with it its own timestep variable, so that particles with widely different dynamical times don't all have to be evolved forward at the rate of that with the shortest time."

This doesn't seem simple at all. In fact, it seems very diffuclt the imagine how you know when things interact with each other if they have different time steps. Am I missing something here?

-Stephen