Symbol for {reversal}: »

Reversal of thermodynamically reversible changes

A thermodynamically reversible change is one that can be reversed by an infinitesimal modification of a variable.

[ reversibility ] < > [ equilibrium ]. Systems at equilibrium can easily undergo reversible change.

Elastic deformation

In the region of elastic deformation, strain is proportional to the stress applied to a material and is reversible: » :- ( of shape).

Deceleration

Deceleration is interpreted as {reversal} :- (acceleration.)

Negation

Negation, the logical operation on propositions, is interpreted as an instance of {reversal}, both internal and external negation.

Undoing

Undoing, in the 'Edit' mode of many computer programs, is an instance of »

Inversion (musical intervals)

The inversion of the interval C (lower pitch) - G (higher pitch) is G (lower pitch) - C (higher pitch). »:- (lower pitch, higher pitch) (higher pitch, lower pitch).