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I Proof of some identities regarding spin angular momentum.

  1. Apr 29, 2017 #1
    If we define Si=(1/2)× (reduced Planck's const)×sigma
    Then what will be (sigma dot vect{A})multiplied by (Sigma dot vect{B})
    Here (sigma)i is Pauli matrix.
    Next one is, what will we get from simplifying
    <Alpha|vect{S}|Alpha> where vect{S} is spin vector & |Apha>is equal to " exp[{i×(vect{S} dot (n_hat))× Theta/(reduced Planck's const)}]
  2. jcsd
  3. Apr 29, 2017 #2


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    Science Advisor
    Homework Helper

    Well, first help your reader by learning how to use LaTex. This is very easy and we have a tutorial on this forum. Then what is "multiplied" ?
  4. Apr 29, 2017 #3


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    Staff: Mentor

    Namely, here: https://www.physicsforums.com/help/latexhelp/

    To start you off, the code S_i = \frac 1 2 \hbar \sigma enclosed in the appropriate delimiters (as described in the link above) produces $$S_i = \frac 1 2 \hbar \sigma$$ Is this what you intended to write for your first equation?
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