Reversibility and the Preservation of Distinguishability

This paper examines how reversible transformations preserve differences between states and under what conditions they preserve the best achievable discrimination reliability. Simple examples distinguish the loss of a difference from its inaccessibility to an observer. The discussion also explains the importance of system boundaries and why processing alone cannot restore evidence absent from the available data. These results are stated with explicit assumptions and do not establish a universal physical conservation law. удалил