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What exactly is a dimension?

  1. Oct 14, 2015 #1
    Hey guys!

    After watching another awesome video of minutephysics:

    I couldn't help but wonder, what is a dimension?

    Thanks for your replies in advance,
  2. jcsd
  3. Oct 14, 2015 #2
    I think dimension is most clearly defined mathematically, if a space need at least N numbers in any one of its coordinate systems, then the space is of N dimension. The space-time we live in is 4 dimensional, which includes 3 number to denote location, and one number to denote time.
  4. Oct 14, 2015 #3


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    Science Advisor
    Gold Member

    There are many different types of definitions of dimension in Mathematics: Hausdorff, Lebesgue covering, etc.
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