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Help with derivation

  1. Sep 19, 2013 #1
    Hello there!
    I'm trying to read a set of notes on the standard model and the author states the following equality without any explanation:
    [tex]-u^{-1}(\partial_\mu u)u^{-1} = \partial_\mu(u^{-1}), [/tex]
    u is here a NxN representation of some continuous gauge group and is a function over spacetime.
    Does this equality hold and in that case why?

    // Kontilera
  2. jcsd
  3. Sep 19, 2013 #2
    Solved it!
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