(economics, political science) The theory, usually associated with Marxian economics, that freely reproducible goods get their value from socially necessary human labor time.

(set theory) An early and influential axiomatisation of set theory.

A heterodox economic school of thought that posits that fiscal policy, set to constrain inflation and enable full employment, should be the primary economic stabiliser and prioritises reflection on the nature of money from a chartalist perspective.

(psychology) An early hypothesis as to the origin and nature of emotions, stating that physiological arousal instigates the experience of emotion.

(Christianity, theology, informal) The Christus Victor theory of atonement.

(creationism) A neo-creationist hypothesis which claims that the first life and the universe appeared abruptly, and that plants and animals appeared abruptly in complex form.

Alternative form of abrupt appearance theory

plural of Sturm-Liouville theory

(mathematics)

(economics, political science) UK standard spelling of labor-value theory.