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Jun 11 at 9:35 comment added Dave Benson @MehmetOnat The symbol $\simeq$ denotes homotopy equivalence, while $\cong$ denotes isomorphism.
Jun 11 at 7:01 comment added Mehmet Onat The unitary group $U(n)$ is a subgroup of $GL_n(C)$. You say isomorphic.
Jun 10 at 22:21 history edited John Rognes CC BY-SA 4.0
(Edited per request to add more detail.)
Jun 10 at 19:07 history edited LSpice CC BY-SA 4.0
`\smash`
Jun 10 at 11:20 history answered John Rognes CC BY-SA 4.0