Physics is shit

So you have this gravity law. But does particle attract itself?

I.e. does it work like (mapcar (lambda (X) (gravity X Xs)) Xs) or X should be excluded from Xs, before gravity applies?

>>10
There are no particles, only fields and perturbations in them.
What "fields" are made of? Obviously they are discrete in the end, so there must be some kind of correlated particles.