Saturday, December 8, 2018

quantum mechanics - Confusion with identity operator


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In the above example why the identity matrix ie ∑|x〉〈x|...is taken as ∫|x〉〈x| dx from negetive to positive infinity? or alternatively can someone explain the steps to expand the ket ψ into x basis




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...