In physics, it's common to use the relations r′=Rr; and r′⋅σ=U(r⋅σ)U†
Question Note that the above proof of 2-to-1 homomorphism is based on fundamental representations of SO(3) and SU(2). But for any odd-dimensional representation of SU(2), if U has determinant +1, −U is not a representation of SU(2) since it has determinant −1. Hence, if U is a member of an odd-dimensional representation of SU(2). U is not. Does it mean that 2-to-1 homomorphism between SU(2) and SO(3) is not true in general?
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