The calculated amount of oxygen which would be required to fully oxidize an organic compound

(mathematics) Alternative form of graph-theoretical

A mathematician whose work is in game theory.

(translation studies) The idea that translating and interpreting should primarily take into account the function of both the source and target text.

based on, or inspired by, string theory

(somewhat rare) A number theorist.

Alternative form of group theoretic

Having to do with group theory.

(rare) A group theorist.

Having to do with ring theory.