Laws like Newton's

Abstract
Instantaneous interaction for n particles is defined in terms of kinematic concepts only. A set of ``laws,'' reminiscent of, but much weaker than, Newton's three laws, is formulated in solely kinematic terms. Invariance under the Euclidean group, the Galilean group, and the special Galilean group is defined, and the most general interactions satisfying the laws, and invariant under these groups, are found. It is shown that they all satisfy Newton's laws. It is shown that the interaction between moving charges cannot be instantaneous and Galilean-invariant.

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