A theory that explains the aggregation of aqueous dispersions quantitatively and describes the force between charged surfaces interacting through a liquid medium.

(chemistry) Any theory that relates collisions among particles to reaction rate; reaction rate depends on such factors as concentration, surface area, temperature, stirring, and the presence of either a catalyst or an inhibitor.

A political theory that holds that control of Eurasia and Africa (the World Island) is achieved via control of the countries bordering the Soviet Union

(philosophy) Theory in medieval Europe to explain then-modern events from an Aristotelian context.

(physics) The theories of special relativity and general relativity, two theories in physics developed mainly by Albert Einstein at the beginning of the 20th century from which several important results such as the equivalence of matter and energy and the Einstein field equations are derived.

(dated) atomic theory

(mathematics) The branch of mathematics dealing with the art of transmitting messages reliably over a noisy channel by adding redundancy to the message.

(mathematics) The branch of mathematics dealing with dynamical systems which can undergo abrupt irreversible qualitative changes due to a tiny change in parameters.

(physics) A candidate unified theory of all physical forces and particles; a theory which suggests that subatomic particles are one-dimensional strings rather than zero-dimensional points. It also suggests that space-time can have up to nine dimensions, plus the dimension of time.

The branch of mathematics dealing with the algebraic structure of rings.