From: ram@zedat.fu-berlin.de   
      
   ram@zedat.fu-berlin.de (Stefan Ram) writes:   
   >Let a hypothetical one-dimensional world consist of a ray with   
   >values x>=0. This world is completely empty except for a mass   
   >point with unit mass 1 at x=1. This is described by a "mass   
   >density" R(x), which is zero everywhere except for R(1)=1.   
   ...   
   >[[Mod. note -- In order to have unit mass, doesn't your mass density   
   >need to be a Dirac delta-function?  -- jt]]   
      
     Yes.   
      
     To avoid delta functions, I could as well define a mass   
     density R(x) := 1/E if 1 <= x < 1+E, and R(x) := 0, otherwise;   
     for an E > 0, say, E := 0.5.   
      
     The mass density of the two-dimensional extension then   
     correspondingly becomes R(x,y) := 1/E if 1 <= x < 1+E   
     and R(x,y) := 0, otherwise.   
      
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