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Homework Help: Complex numbers/matrix

  1. Feb 1, 2012 #1
    1. The problem statement, all variables and given/known data

    I'm part way through a problem and got the answer [tex] P_x=c_+^* c_-+c_-^*c_+ [/tex].
    But the answer should be [tex] 2Re(c+^*c_-) [/tex].

    Are the two equivalent?

    2. Relevant equations

    [tex] c+c^*=2Re(c) [/tex]
     
  2. jcsd
  3. Feb 2, 2012 #2

    Redbelly98

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    That depends. Is c-*·c+ equal to (c+*·c-)* ? If so, then you can apply:
     
  4. Feb 2, 2012 #3
    Just complex conjugate on of the both terms
     
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