### theory | model | stochastic process:

Random walk
* are important in a number of biological applications as well
  - stochastic processes
* models the motion of a small particle in a thin tube of water.

### theory | model:

String theory
* String theories are models
  - have a coupling constant
* attempts to resolve such contradictions with a logically consistent set of rules.
* describes states in terms of vertex-operators
  - the black hole as a bound state of specific constituents
* has a rich mathematical structure that is still being explored
  - two defining features
* helps in a number of ways.
* is an example of a theory of quantum gravity
  - believed to be the long sought after unified theory of everything
  - currently our best hope of unifying physics
* is one of the most interesting developments in modern physics
  - laughable contraptions physicists have ever devised
* postulates the existence of additional dimensions.
* promising candidate for a complete quantum theory of gravity.
* proposal to unify gravitation with the other forces in a single quantum theory.
* says that there are long, one dimensional, strings that float around the universe.
* very recent development in physics.
+ Coupling constant: Quantum mechanics :: Statistics
  * This also can happen in string theory. String theories have a coupling constant. It determines the probability that a 1-dimensional string of energy will separate into 'two' separate energy strings. But unlike in particle theories, the string coupling constant is not just a number, but depends on one of the oscillation modes of the string.

Supermodel
* are fashion models
  - known for their provocative struts down the catwalk
  - mannequins
  - models that are at the top of their careers
* is an exhibition of exquisite models made of precious metals.

Supersymmetric model
* Most supersymmetric models predict the existence of such particles, which are called neutralinos.
* involve a new discrete quantum number called R-parity.

Theoretical model
* Many theoretical models exist which attempt to explain observed phenomena.
* are attempts to emulate nature's response.

Modern theory
* Modern theories explain motion
  - state that a gluon particle acts to hold the nucleus together
* Most modern theories explain motion.
* Some modern theories predict reproductive success.
* portrays that a star begins inside a nebula and contracts.

Molecular theory
* Molecular theories come from observations.
* Most molecular theories come from observations.
* believes memory is based upon changes in the molecules that make up the neuron.

Moral theory
* All moral theories work with a picture of what lies within human capacity.
* Moral theories are either absolutist or relativist.
* seeks to introduce a degree of rationality and rigour into our moral deliberations.

### theory:

Music theory
* attempts to simplify the complexities of music.
* collection of harmonic principles which form the basis of our musical heritage.
* encompasses a variety of activities which all focus on understanding music
  - the nature and mechanics of music
* helps in the communication of a musical idea.
* includes both written music theory and aural skills.
* is developed almost entirely from abstract systems of organizing pitch and rhythm
  - in general overwhelming obsessed with aspects of pitch
  - the principal foundation for musical understanding and musicianship
* makes no sense without relating it to musical sounds.

Normative theory
* Normative theories are theories about what is of value and what acts are right.
* aims to articulate the values that constitutional law ought to realize.
* refers to theories that are morally-laden and polemical.