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Homework Help: Poisson brackets

  1. Jan 22, 2010 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution

    Hi, what is the correct definition for a Poisson bracket?
    Some books say it is:

    {f,g} = df/dp.dg/dq - df/dq.dg/dp

    but others say it is:

    {f,g} = df/dq.dg/dp - df/dp.dg/dq

    One is the other multiplied by -1.
    Which is the correct definition?

    Thanks for any help.
  2. jcsd
  3. Jan 22, 2010 #2
    You CAN use either the first definition or the other one and this only depends on author's style though if I were you, I would take the second one for granted in being more common and true.

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