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Bra-Ket notation

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    If I have  \displaystyle \sum_{m} P_m |m \rangle \langle m| . Why does this result in a diagonal matrix?
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    Write out \left| m \right> \left< m \right| as a matrix. What is it?
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    (Original post by Zhen Lin)
    Write out \left| m \right> \left< m \right| as a matrix. What is it?
    EDIT: nevermind i got it. Thanks.

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