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

(mathematics) a theorem providing conditions under which an operator or matrix can be diagonalized

(criminology) A criminological theory stating that signs of urban decay (e.g. broken windows, graffiti) signal that an area is not monitored, encouraging more destructive criminal behavior.

(probability theory) A theorem expressed as an equation that describes the conditional probability of an event or state given prior knowledge of another event.

A theoretical explanation for departures from ideality in solutions of electrolytes.

(mathematics) A theorem stating that every positive integer can be represented uniquely as the sum of one or more distinct Fibonacci numbers in such a way that the sum does not include any two consecutive Fibonacci numbers.

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.

Goddard-Thorn theorem

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

(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