(chemistry, physics) A description of various properties of transition element complex compounds that compares the effects of its ligands to that of neighbouring atoms in a crystal

(particle physics) A proposal for the resolution of the strong CP problem. It proposes that the QCD Lagrangian be extended with a CP-violating term known as the θ parameter, and that this should be a dynamic field rather than a constant value. It also predicts the existence of particles called axions.

A theory of cognition according to which visual and verbal information are both used to represent information, but processed in different ways.

A speculative theory of the origins of spoken language, according to which all things have a vibrating natural resonance, echoed somehow in the earliest words of human beings.

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

(physics, chemistry) A method of determining the structure of a molecule by assuming that electrons are not fixed to bonds between individual atoms

Information theory adapted to deal with information held and/or handled by quantum systems, i.e., in which information is measured in qubits instead of classical bits.

A theory of communication arguing that people adjust their speech and gestures to accommodate to others with whom they are interacting.

(quantum mechanics) A theory of quantum fields; the result of applying second quantization to Classical Relativistic Field Theory.

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