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Field of singularities

  1. Sep 9, 2003 #1
    Is it possible to have a field f([pard](x)) - fractal or otherwise - where [pard](x) are discrete Dirac delta functions, and f interrelates the various magnitudes of those singularities as a conventional field would for points over a continuum?
     
  2. jcsd
  3. Sep 10, 2003 #2

    selfAdjoint

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    I think the phrase "various magnitudes of all the singularities" is a contradiction in terms. a δ doesn't have a value until it's integrated, as in ∫f(x)δ(x-a)dx = f(a).
     
  4. Sep 10, 2003 #3
    selfAdjoint,

    Couldn't local Dirac singularities in my proposed field represent also various magnitudes obeying their point-by-point (distribution) normalization through overall integration?
     
  5. Sep 11, 2003 #4

    selfAdjoint

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    Loren, go back and look at the integral I posted, notice that f(x) in there. It could be anything. What the Dirac δ does is to pick out a particular value of any function that you integrate. Dirac modelled it on the finite case of a vector like (0,1,0). If you inner multiply that by any arbitrary vector (a,b,c) you get
    (a,b,c)(0,1,0) = 0*a + 1*b + 0*c = b
    (so it picks out the second component, and if you used a 1 in a different place you would pick out a different component. Now in QM math the integral of the product of two "functions" is an inner product in the algebra of those functions, so δ(x-a) in the integral picks out the "a-value component" of the function.
     
    Last edited: Sep 11, 2003
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