About {theme} theory

{reversal} is a {theme}. The most important single {theme} is {linkage}, < >, which, like other {themes}, plays a fundamental role in the mind's making sense of experience, as well as concepts not originating in experience. For more detailed information about the {themes} and my approach, a study of Introduction to {theme} theory would be very useful (I have to say, indispensable). From the introduction:  

'{theme} theory is completely general and philosophy is only one application-sphere. These illustrative examples are very diverse in subject matter and  in degree of abstraction: for example ethical argument, concrete problems in applied ethics, Nazi atrocities, Stalin, the death penalty, mathematical and philosophical relations, the completion of a  proof, scientific correlation.  There are also marked differences in tone: the tone appropriate to abstract and systematic subject matter but also forthright criticism, for example of Nietzsche, the juxtaposition sometimes of the abstract and  the impassioned.'

'{theme} theory is based upon the conscious, and justifiable, ignoring in many cases of sphere-boundaries, such as the boundaries separating the material sphere, the conceptual sphere, the spheres of the different senses. A mathematician may attack a problem in the mind just as a soldier may attack an all-too-concrete machine-gun post. A scientific model may be material, the model constructed from materials of different kinds, such as wood and plastic, or the model may be purely conceptual, without material expression. Scientific modelling is an activity which can be practised in material or conceptual ways. Linkages may be material, such as a connecting rod in a mechanical system linking mechanical components or non-material, such as the ties of shared history linking, in some cases, nations.'

List of {themes}:

{contrast} ( )
{distance} D
{linkage} < >
{restriction} ==
{separation} //
{substitution} S

In the list, the name of each {theme} is followed by the symbol for the {theme}. Clicking on the {theme} gives access to a page which gives instances of the {theme}. These instances show something of the range of {theme} theory, which addresses the most diverse areas of human experience and knowledge.

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


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


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).