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fourth dimension |
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fourth dimension 1. the dimension of time, which is necessary in addition to three spatial dimensions to specify fully the position and behaviour of a point or particle 2. the concept in science fiction of a dimension in addition to three spatial dimensions, used to explain supranatural phenomena, events, etc. fourth dimension [¦fȯrth də′men·chən] (relativity) Time in the theory of relativity, in which space and time are conceived as particular aspects of a four-dimensional world. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In fact, talking about Figure 7 is quite hard: it is actually a two-dimensional representation (a drawing on paper) of a three-dimensional representation (the straw construction hanging in space from the ceiling) of a four-dimensional object (the real tesseract in four-dimensional space with four mutually perpendicular directions apparent at the vertices). Although it's impossible to visualize, we can mathematically describe a hypercube in four-dimensional space. Mathematicians also study what they call the three-dimensional sphere--the set of all points a given distance from a center in four-dimensional space. |
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