I was reading Dirac's "The principle of QM" and bit of confused.(adsbygoogle = window.adsbygoogle || []).push({});

In equation (21) does the number 1 in the sum or outside of the sum? If out side how come the sum over r is 1? X function is the quotient when the factors diveded by single one factor. for example if a*b*c*d then X_b is a*c*d

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# I Express ket as eigenkets

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