Information for "Dimension"

Basic information

Display titleDimension
Default sort keyDimension
Page length (in bytes)31,846
Page ID8398
Page content languageEnglish


From left to right: the square, the cube and the tesseract. The two-dimensional (2d) square is bounded by one-dimensional (1d) lines; the three-dimensional (3d) cube by two-dimensional areas; and the four-dimensional (4d) tesseract by three-dimensional volumes. For display on a two-dimensional surface such as a screen, the 3d cube and 4d tesseract require projection.

In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Thus a line has a dimension of one because only one coordinate is needed to specify a point on it

  1. REDIRECT example, the point at 5 on a number line. A surface such as a plane or the surface of a cylinder or sphere has a dimension of two because two coordinates are needed to specify a point on it
  2. REDIRECT example, both a latitude and longitude are required to locate a point on the surface of a sphere. The inside of a cube, a cylinder or a sphere is three-dimensional because three coordinates are needed to locate a point within these spaces.

In classical mechanics, space and time are different categories and refer to absolute space and time. That conception of the world is a four-dimensional space but not the one that was found necessary to describe electromagnetism. The four dimensions of spacetime consist of events that are not absolutely defined spatially and temporally, but rather are known relative to the motion of an observer. Minkowski space first approximates the universe without gravity; the pseudo-Riemannian manifolds of general relativity describe spacetime with matter and gravity. Ten dimensions are used to describe string theory, and the state-space of quantum mechanics is an infinite-dimensional function space.

The concept of dimension is not restricted to physical objects. High-dimensional spaces frequently occur in mathematics and the sciences. They may be parameter spaces or configuration spaces such as in Lagrangian or Hamiltonian mechanics; these are abstract spaces, independent of the physical space we live in.

Dimension sections
Intro   In mathematics    In physics    Networks and dimension    In literature    In philosophy    More dimensions    See also    References    Further reading    External links   

PREVIOUS: IntroNEXT: In mathematics
Page content modelwikitext
Indexing by robotsAllowed
Number of views354
Number of redirects to this page18

Page protection

EditAllow all users
MoveAllow all users

Edit history

Page creatorWcherowi (Talk | contribs)
Date of page creation04:23, 21 September 2015
Latest editorWcherowi (Talk | contribs)
Date of latest edit04:23, 21 September 2015
Total number of edits1
Total number of distinct authors1
Recent number of edits (within past 91 days)0
Recent number of distinct authors0