(economics) A theory that abstinence in business will bring beneficial interest.

plural of theory of relativity

A mathematical technique for finding an approximate solution to a problem that cannot be solved exactly, by starting from the exact solution of a related problem; used in modelling physical interactions between particles, etc.

(physics) A mathematical approach to developing a theory of everything in theoretical physics, based on quantizing spacetime into units called metrons.

(physics) The theory that (most) baryons and mesons are composed of bound quarks and antiquarks.

(uncountable, algebra, algebraic geometry, algebraic topology) The study of rings R generated by the set of vector bundles over some topological space or scheme;

(mathematics, uncountable) The study of the properties of dynamic systems over large timescales.

plural of ergodic theory

(topology) The branch of topology devoted to the study of continua, a type of metric space.

(psychology) The ability to form an opinion about what other people are thinking.