On 8/6/2022 5:16 AM, Jesse Mazer wrote:
The question of whether a process happening to particular bits of matter can be reversed in those same bits of matter may be an interesting one worth thinking about, but I think it creates unnecessary confusion to use the term "reversibility" to talk about this, since that isn't what physicists mean by reversibility. They're talking about whether, if you have a solution to the equations of motion, the reversed version is also a solution--the identity of the bits of matter involved isn't relevant,
I agree with that, but a solution of the equations of motion depends on boundary conditions, not just the equations of motion. So some boundary are nomologically impossible to realize in reverse and some are only FAPP impossible to realize in reverse.
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