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Dimension in physics

  1. Jan 2, 2015 #1
    I know this has been mulled over time and time again in different threads, so I will keep it short.

    Which statement is more consistant with reality:

    1. A dimension = all existing and non-existing points along an axis.
    2. A dimension = all existing, but only existing points along an axis.

    (change 'points' into 'events', 'interactions' or whatever else you prefer)

    Thank you.
  2. jcsd
  3. Jan 2, 2015 #2


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    Gold Member

    What you mean by existence?
  4. Jan 2, 2015 #3
    Usually a dimension is assumed to be infinite (number 1) but it is typically a range of values for a unique characteristic of which limits of existence can be constraints in that range.
  5. Jan 2, 2015 #4
    How large is a point? Please specify in e.g. meters1, meters2 or meters3, whatever you prefer.

    My question is a trick question.
  6. Jan 2, 2015 #5
    Okay, let's go with the flow.

    What are the 'points' of the 4-dimensional universe around us? Are they the independant, fundamental elements? Like, maybe, photons, electrons, quarks?
    Or is the 4-dimensional universe made up of collisions, interactions, relations between these elements?

    Which is the basic stuff of reality?
    (or to be fair: maybe both or neither, or you have some other answer)
  7. Jan 2, 2015 #6


    Staff: Mentor

    We stick to standard definitions here.
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