Prove Eqs. (6.42) and (6.43), thus showing that the dimension of the (mathrm{SO}(3)) irrep labeled by (j)

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Prove Eqs. (6.42) and (6.43), thus showing that the dimension of the \(\mathrm{SO}(3)\) irrep labeled by \(j\) is the character \(2 j+1\) of the identity. Rearrange the sum and use

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Then take the limit \(\alpha \rightarrow 0\) to define the identity element. 

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