### theory:

Ergodic theory
* is also important in studying the geometry of manifolds with negative curvature.
* is the study of the statistical behaviour of a dynamical system
  - theory of the long-term statistical behavior of dynamical systems
* overlaps with smooth dynamical systems.
* studies the average properties of general time evolutions on measure spaces
  - probabilistic behavior of dynamical systems as they evolve through time

Ethical theory
* All ethical theories use various normative ethical principles in assessing actions and behavior.
* Ethical theories Understand different theories or approaches to ethical reasoning.
* arises out of the cultural life of a people.
* assumes the value of human relationships.
* makes some assumptions about human nature.
* provides categories and procedures for determining what is ethically relevant.

### theory:

Evolutionary theory
* Evolutionary theories are a way of explaining the fact of evolution.
* Evolutionary theories base on natural selections
  - begin with certain assumptions that pertain to the long-ago historical past
* Most evolutionary theories base on natural selections.
* Some evolutionary theories explain origins
  - relate to origins
* argues that all the organisms alive on Earth today share a common ancestor.
* assumes that the universe is undesigned.
* basic component of biological literacy.
* describes and defines the fact of evolution
  - the descent with modification of species
* explains and describes the fact that evolution occured and occurs
  - the past based on the assumption that the process is random
* is arguably the most thoroughly tested theory in science
  - central to modern biological science
  - no mere adjunct to biology
  - the unifying theme of all biological sciences
* lays the seeds for the destruction of civilization.
* predicts late-life mortality plateaus
  - that everything alive uses the same chart
* proposes a history of life on the earth for which there is no human testimony.
* requires change by random action alone
  - that matter originally made itself out of nothing
* says that life occurred spontaneously, with no external agent.
* speaks of the natural selection of changes wrought by random mutations
  - to how living things have changed through time
* teaches that plants and animals drop to the ground, die, and make fossils.
* traces the ancestry of man through early hominids back to primates.

Facet theory
* involves a formal way of classifying variables.
* systematic approach for coordinating theory and research.

Field theory
* Field theories are theories.
* collection of rules that determine how fields behave and evolve.
* is used to discuss problems in strong, electromagnetic, and weak interactions.
* leads to simple electrodynamics and circuit analysis.
* powerful tool to study phenomena involving many degrees of freedom.

### theory:

Graph theory
* approaches to deadlock analysis of large-scale process network.
* central area in combinatorics.
* deals with the study of a finite set of points connected by lines.
* is an important part of mathematics and computer science
  - interesting area of mathematics that has many applications in computer science
  - obvious place where graphical representations are used
* subdiscipline of combinatorics.
+ Graph theory, Graph theory in perspective
  * Graph theory is an important part of mathematics and computer science. To many such problems, exact solutions do exist. Many times however, they are very hard to calculate. Therefore, very often, approximations are used.

Growth theory
* Growth theories include explanations.
* Some growth theories focus on input.
* is now a recognized sub-discipline of the economics profession.
* separates investment in capital and investment in technology.