nix29 Posted December 15, 2017 Posted December 15, 2017 I was wondering what the fourth dimension might be, if a point is 0, a line 1, a square 2, a cube 3 dimensional. What would a 4 dimensional "cube" look like? My thinking went that if a metre cube sat in the same position this could be it. But would that be a cubic metre x second? So I googled metre second and found this link.. so if you know what a four dimensional cube looks like, let me know.
Strange Posted December 15, 2017 Posted December 15, 2017 On 12/15/2017 at 9:03 AM, nix29 said: I was wondering what the fourth dimension might be, if a point is 0, a line 1, a square 2, a cube 3 dimensional. What would a 4 dimensional "cube" look like? My thinking went that if a metre cube sat in the same position this could be it. But would that be a cubic metre x second? So I googled metre second and found this link.. so if you know what a four dimensional cube looks like, let me know. Expand This appears to be completely off-topic. Anyway, replace each of the faces of a cube with cubes (I know, not possible in three dimensions): https://en.m.wikipedia.org/wiki/Tesseract
mathematic Posted December 16, 2017 Posted December 16, 2017 Are you looking for a physics definition, such as time in the theory of relativity, or a mathematics definition, such as defining points by number quadruples?
Vmedvil Posted December 21, 2017 Posted December 21, 2017 (edited) On 12/15/2017 at 9:03 AM, nix29 said: I was wondering what the fourth dimension might be, if a point is 0, a line 1, a square 2, a cube 3 dimensional. What would a 4 dimensional "cube" look like? My thinking went that if a metre cube sat in the same position this could be it. But would that be a cubic metre x second? So I googled metre second and found this link.. so if you know what a four dimensional cube looks like, let me know. Expand It is exactly as you think. A little deeper into this rabbit hole of "higher dimensions" Edited December 21, 2017 by Vmedvil
Country Boy Posted January 21, 2018 Posted January 21, 2018 A "dimension" just means a number used to specify something of interest. If I am marking points on a straight line, then I can designate one of those points, arbitrarily, and designate every point by its distance along that line from that point, using positive and negative to specify "left" or "right" of that point. One number, dimension one. On a plane there are a whole circle of points at a fixed distance from a fixed point so I would also need to specify a direction- two numbers, dimension two. Physicists are interested in "events"- what happens at a specific position at a specific time. It takes three numbers to specify the position and one to specify time. Therefore "four dimensions". 1
Marc S Reiter Posted April 1, 2018 Posted April 1, 2018 https://twitter.com/4DGeometry There you go, 150 pages on the actual 4-dimensional geometry. You're welcomed.
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