From: g.scholten@gmx.de   
      
   Sabbir Rahman wrote:   
      
   >> Ok, at least we have clarified now what you are talking about.   
   >>   
   >> So now, if we consider some spherically symmetric matter distribution   
   >> (no matter if it is a dust cloud, a rigid structure or a rigid structure   
   >> with a dust shell around) with a boundary (surface) at radial coordinate   
   >> r=R, it turns out that for r > R, the Schwarzschild metric S(r,t)   
   >> applies, whereas for r < R, somme different metric R(r,t) applies,   
   >> however with the property that for r approaching R from below, R(r,t)   
   >> approaches smoothly the Schwarzschild metric S(r,t):   
   >>   
   >> \lim_{r -> R} R(r,t) = S(R,t)   
   >>   
   >> So, at r = R, R(R,t) and S(R,t) are equal, whereas at R - dr, R(R - dr,   
   >> t) and S(R - dr, t) differ infinitesimally.   
   >   
   > My claim is that this is only true up to the time of formation of the   
   > black hole. After that, the two submanifolds become separated and this   
   > boundary condition no longer holds.   
      
   And this claim is wrong. My statement is true for R < rs (after   
   formation of the black hole) as well for R > rs.   
      
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