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Woit · 2025-10-20
已登记出处中的最早位置:§5.2 · en。
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§5.2 · en · original_transcription · ai-transcription-compared
Note that these matrices form a subspace of of half the dimension, so of real dimension . is a real vector space of dimension , but it is NOT a space of real by matrices. It is the space of skew-Hermitian matrices, which are generally complex. While the matrices are complex, only real linear combinations of skew-Hermitian matrices are skew-Hermitian (recall that multiplication by changes a skew-Hermitian matrix into a Hermitian matrix). Within this space of skew-Hermitian complex matrices, if one looks at the subspace of real matrices one gets the sub-Lie algebra of antisymmetric matrices (the Lie algebra of ).