hi ,i see from a book su(2) has the form(adsbygoogle = window.adsbygoogle || []).push({});

U[tex]\left(\hat{n},\omega\right)[/tex]=1cos[tex]\frac{\omega}{2}[/tex]-i[tex]\sigma[/tex]sin[tex]\frac{\omega}{2}[/tex]

in getting the relation with so(3),why we choose [tex]\frac{\omega}{2}[/tex],how about changing for [tex]\omega[/tex]?

thank you

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# Lie algebra su(2)

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