Ciro Santilli
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Unitary group () | 🗖 nosplit | ↑ parent "Important Lie groups" | 77, 3, 147

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Complex analogue of the orthogonal group.
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One notable difference from the orthogonal group however is that the unitary group is connected "because" its determinant is not fixed to two disconnected values 1/-1, but rather goes around in a continuous unit circle. is the unit circle.
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