|Abstract||An inﬁnite number of elastically colliding balls is considered in a classical, and then in a relativistic setting. Energy and momentum are not necessarily conserved globally, even though each collision does separately conserve them. This result holds in particular when the total mass of all the balls is ﬁnite, and even when the spatial extent and temporal duration of the process are also ﬁnite. Further, the process is shown to be indeterministic: there is an arbitrary parameter in the general solution that corresponds to the injection of an arbitrary amount of energy (classically), or energy-momentum (relativistically), into the system at the point of accumulation of the locations of the balls. Speciﬁc examples are given that illustrate these counter-intuitive results, including one in which all the balls move with the same velocity after every collision has taken place.|
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