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Square symbol

  1. Apr 2, 2009 #1
    what is it i cannot under stand this or other equation(Adiabatic Change p ⁢ V γ = const )
    Last edited by a moderator: Apr 2, 2009
  2. jcsd
  3. Apr 2, 2009 #2
    I think it is a 4 dimensional Laplacian (x, y, z, and time).
  4. Apr 5, 2009 #3
    Hi Mike
    The standard Laplacian in rectilinear coordinates is
    del2 E = d2E/dx2 + d2E/dy2 + d2E/dy2 = 0

    We add to it another term: -1/c2 d2E/dt2

    to get

    box2 E = d2E/dx2 + d2E/dy2 + d2E/dy2 -1/c2 d2E/dt2= 0

    So the square box is the Laplacian in 4 coordinates: x, y, z, and t
    Last edited: Apr 5, 2009
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