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Simple problem with tensors

  1. Oct 19, 2012 #1
    Hi... here it is... sorry for my english...

    http://sphotos-c.ak.fbcdn.net/hphotos-ak-ash4/297165_4722421629188_964469850_n.jpg [Broken]
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 19, 2012 #2

    TSny

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    Hello. Looks like you replaced [itex]A^\rho[/itex] by [itex]g^{\alpha\beta}A_\beta[/itex]. What happened to ##\rho## and how did ##\alpha## appear? Similarly for your indices on the partial derivative: ##\sigma## disappears while ##\eta## suddenly appears.
     
  4. Oct 20, 2012 #3
    Thanks Tsny, ...but it's a simply rename of the index... i mean... i think this is not the problem..
     
  5. Oct 20, 2012 #4

    dextercioby

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    You can't rename free indices, only 'dummy' (ones summed over) ones.
     
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