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A surprising operator

  1. Apr 26, 2009 #1
    im studing orthogonalized plane wave method(OPW) IN SOLID STATE PHYSICS. during derivation ,i have difficulty.my question is , is a KET-BRA notation acts like an operator? i.e. Ia><bI .plz help
  2. jcsd
  3. Apr 26, 2009 #2


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    Yes, |a><b| is defined by |a><b| (|u>)= |a>(<b|u>).
  4. Apr 26, 2009 #3
    If you like to think geometrically, this operator takes the projection of your vector |u> onto the vector |b>, which is just some number, and then creates a vector in the |a> direction scaled by this amount.
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