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Homework Help: How to define a noncommutative derivative

  1. Sep 22, 2009 #1
    first of all, i don't know if this is the correct place to post this topic, if no tell me.

    My question is, i have a definition of derivative that can not be applied to a noncommutative space. How i can define a derivative in a noncommutative space?

    thank you.
  2. jcsd
  3. Sep 22, 2009 #2
    What is an example of a "noncommutative space" where you wish to do this?
  4. Sep 22, 2009 #3
    k-poincarè... [X_i,X_j]=\theta_{ijk}X_k
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