Time reversal

Time reversal may refer to:

In physics, T-symmetry - the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed — ie. where a mirror (reverse) transformation is applied to a forward direction time state.

Time Reversal Signal Processing, a signal processing technique popular in acoustics, and currently being applied to electromagnetics, that results from the reversal in time of a system's response signal

Time travel, theorised and speculative concepts about travelling physically through time

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