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Are these power series? Weakly gravitating source-MTW &19.1

  1. Mar 5, 2013 #1
    hello
    Please see attachment which is a snapshot from MTW first page of chapter 19. Can someone please elaborate on how the equations 19.3b and c can be explained ?
    I know that equation 19.3a is a familiar formula but not so much the other two. I'm just confused.
    Thank you,
    Long live & clear skies.
     

    Attached Files:

  2. jcsd
  3. Mar 5, 2013 #2

    robphy

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    Look up "Multipole expansion"
     
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