Reversible Turing Machines
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Reversibility can refer to: *
Time reversibility In mathematics and physics, time-reversibility is the property (mathematics), property of a process whose governing rules remain unchanged when the direction of its sequence of actions is reversed. A deterministic process is time-reversible if th ...
, a property of some mathematical or physical processes and systems for which time-reversed dynamics are well defined :* Reversible diffusion, an example of a reversible stochastic process *
Reversible process (thermodynamics) In thermodynamics, a reversible process is a process, involving a system and its surroundings, whose direction can be reversed by infinitesimal changes in some properties of the surroundings, such as pressure or temperature. Throughout an enti ...
, a process or cycle such that the net change at each stage in the combined entropy of the system and its surroundings is zero * Reversible reaction, a chemical reaction for which the position of the chemical equilibrium is very sensitive to the imposed physical conditions; so the reaction can be made to run either forwards or in reverse by changing those conditions *
Reversible computing Reversible computing is any model of computation where every step of the process is time-reversible. This means that, given the output of a computation, it's possible to perfectly reconstruct the input. In systems that progress deterministica ...
, logical reversibility of a computation; a computational step for which a well-defined inverse exists * Reversible error, a legal mistake invalidating a trial * Reversible garment, a garment that can be worn two ways *
Piaget's theory of cognitive development Piaget's theory of cognitive development, or his genetic epistemology, is a comprehensive theory about the nature and development of human intelligence. It was originated by the Swiss developmental psychologist Jean Piaget (1896–1980). The the ...
, in which mental reversibility is part of the concrete operational stage, the understanding that numbers and objects can change and then return to their original state * Reversible playing card, a playing card that may be read either way up {{disambig