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| | Time [Internet Encyclopedia of Philosophy] (Site not responding. Last check: 2007-08-19) |
 | | If physical time, psychological time, and biological time are three different kinds of time, then three answers are required to the question "What is time?" and some commentary is required regarding their relationships, such as whether one is the most fundamental. |
 | | Spacetime is four-dimensional and a continuum, with time being a distinguished, one-dimensional sub-space of this continuum. |
 | | Proper time along a worldline in 4-d spacetime is the time elapsed by an object having that worldline, as shown on an ideal clock having the same worldline. |
| www.iep.utm.edu /t/time.htm (15789 words) |
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