phase space

noun Physics.
a hypothetical space constructed so as to have as many coordinates as are necessary to define the state of a given substance or system.

Origin:
1925–30

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phase space definition

mathematics
The 2n-dimensional space consisting of the possible values of (x1, x1., x2, x2., ..., xn, xn.) for a system of n first-order ordinary differential equations (or more generally, Pfaffian forms).
If n=1, the phase space is known as a phase plane.
(http://mathworld.wolfram.com/PhaseSpace.html).
(2008-05-02)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
In phase space, all that is known about the state of a dynamical system at a
  single moment can be collapsed to a point.
Each potential state of that particle's system corresponds to one unique point
  in a phase space.
Frank and his colleagues work with the geometry of something called phase space.
The temperature of will then increase and the phase space volume of that body's
  dynamics.
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