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Homework Help: Compatible observable properties

  1. Dec 7, 2014 #1
    1. The problem statement, all variables and given/known data
    I have problem with properties of compatible observable

    2. Relevant equations
    [AB,CD]=AB CD – CD AB ………. (1)
    ABCD+ACBD-ACBD-ACDB+ACDB+CADB-CADB-CDAB ………. (2)
    A{C,B}D-AC{D,B}+{C,A}DB-C{D,A}B .......... (3)

    3. The attempt at a solution
    How can the equation (1) become (2), and eq (2) become (3), someone please explain to me about that properties
     
  2. jcsd
  3. Dec 7, 2014 #2

    mfb

    User Avatar
    2017 Award

    Staff: Mentor

    Try to check the other direction: verify that (3) is equal to (2) and then see if you can simplify (2) to (1).
    There is no magic going on.
     
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