High Quality Content by WIKIPEDIA articles! In mathematics, the unitary group of degree n, denoted U(n), is the group of nxn unitary matrices, with the group operation that of matrix multiplication. The unitary group is a subgroup of the general linear group GL(n, C). In the simple case n = 1, the group U(1) corresponds to the circle group, consisting of all complex numbers with absolute value 1 under multiplication. All the unitary groups contain copies of this group. The unitary group U(n) is a real Lie group of dimension n2. The Lie algebra of U(n) consists of complex nxn skew-Hermitian matrices, with the Lie bracket given by the commutator.

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