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    Unclear about the Heisenberg uncertainty principle

    Hi everybody, I have a slightly noobish question and I've searched for the answer unsuccesfully so I'm posting it here. I'm was reading up on the uncertainty priciple when I ran into two phrases that I don't quite understand. They are <A²> and <A>². Am I too apply this as \int \psi^* A^2 \psi...