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1. The philosophical question. Is it possible to have an ideal gas
composed of particles that are identical but distinguishable?
Sec VII in Versteegh is beginning to bother me. I quote: "When the
individual one-particle wave packets in the many-particle state have
small spatial extensions and do not overlap, ... they approximately
follow the paths of classical particles. ... Narrow wave packets can
follow trajectories through space-time, and as long as they remain
separated from each other, these wave packets remain as
distinguishable as classical particles.