deletions | additions       diff --git a/past light cones.tex b/past light cones.tex  index 91689d9..b6d0297 100644  --- a/past light cones.tex  +++ b/past light cones.tex 
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eddington finkelstein  t = v - r  incoming light rays are at 45 degrees regardless of potion  if you’re inside the singularity (r = 2M) then outgoing rays  curve to the positive side on the outside  curve to the negative side if inside