OK, so here's a question.

I have a particle system that implements RK4 integration. It works 
great. However... for each step, it involves computing the force acting 
on a particle several times. That's fine if the force is an invariant 
function of the particle's position and/or velocity (and possibly time). 
But what do you do if the forces acting on a particle depend on the 
positions of the other particles? o_O

-- 
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