Cohen-Tanoudji defines a "standard basis" of the state space as an orthonormal basis {|k,j,m>} composed of eigenvectors common to J² and J_z such that the action of J_± on the basis vectors is given by(adsbygoogle = window.adsbygoogle || []).push({});

[tex]J_{\pm}|k,j,m>=\hbar\sqrt{j(j+1)-m(m\pm 1)}|k,j,m\pm 1>[/tex]

But isn't is automatic that such are the effects of the ladder operators as soon as {|k,j,m>} is an orthonormal basis of simultaneous eigenvectors of J² and J_z???

At least this is the distinct impression I got out of the text preceeding this definition.

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# Standard Basis and Ladder operators

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