(algebraic geometry) The theory of Donaldson-Thomas invariants.

A simple cognitive architecture developed to account qualitatively for a large set of matched pairs of conscious and unconscious processes.

(social sciences, economics, political science, sociology) A theory that argues individual decisions are based on that individual's understanding of the costs and benefits of a given action, shaped throughout the assumptions of self-interest and rational actors.

Alternative form of broken windows theory

A theory of history that sees it as driven by the actions of powerful individuals or those with natural-born greatness.

A hypothesis that explains how flora and fauna migrated between Eurasia and Africa via a land bridge in the Levant region, based on the idea that there were periods of abundant rainfall lasting thousands of years in Africa and associated with a "wet-green Sahara" phase, during which larger lakes and more rivers existed.

Synonym of grand unification theory

(number theory) The subfield of number theory concerning the behaviour of sumsets (integer sets added to each other elementwise).

(uncountable, mathematics, graph theory) The subbranch of graph theory in which algebraic methods are applied to problems about graphs.

(algebraic geometry) K-theory studied from the point of view of algebra.