A theory developed by Terence McKenna that aims to describe "novelty" in the universe based on a combination of numerology and mathematics, and supposed fractal patterns in the I Ching.

(physics) The theory that all gross matter is composed of atoms. / (physics) Any of several theories that explain the structure of the atom, and of subatomic particles.

(logic) Recursion theory. / (computer science) The branch of the theory of computation that studies which problems are computationally solvable using different models.

The branch of abstract algebra dealing with group characters.

(mathematics) A branch of mathematics concerned with dynamical systems which suffer sudden qualitative changes from an infinitesimal change in a parameter.

(algebra, field theory) The branch of mathematics dealing with Galois groups, Galois fields, and polynomial equations.

The branch of mathematics dealing with the algebraic structure of fields. / (psychology) A theory which examines patterns of interaction between individuals and their environment.

(logic) A branch of mathematical logic studying computable functions and Turing degrees, concerned with questions such as "What does it mean for a function on the natural numbers to be computable?" and "Can noncomputable functions be classified into a hierarchy based on their level of noncomputability?".

(mathematics) A branch of mathematics which deals with patterns that inevitably arise in sufficiently large sets (i.e., subsets of some structure).

(mathematics) A branch of mathematics which deals with spaces and maps between them in abstraction, taking similar theorems from various disparate more concrete branches of mathematics and unifying them.