Welcome to the language barrier between physicists and mathematicians Physicists prefer to use hermitian operators, while mathematicians are not biased towards hermitian operators The generators of $so(n)$ are pure imaginary antisymmetric $n \\times n$ matrices I have known the data of $\\pi_m(so(n))$ from this table The question really is that simple Prove that the manifold $so (n) \subset gl (n, \mathbb {r})$ is connected
It is very easy to see that the elements of $so (n. I'm not aware of another natural geometric object. I'm looking for a reference/proof where i can understand the irreps of $so(n)$ I'm particularly interested in the case when $n=2m$ is even, and i'm really only. So, the quotient map from one lie group to another with a discrete kernel is a covering map hence $\operatorname {pin}_n (\mathbb r)\rightarrow\operatorname {pin}_n (\mathbb r)/\ {\pm1\}$ is a covering map as @moishekohan mentioned in the comment I hope this resolves the first question
U(n) and so(n) are quite important groups in physics I thought i would find this with an easy google search What is the lie algebra and lie bracket of the two groups? Are $so (n)\times z_2$ and $o (n)$ isomorphic as topological groups
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