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Aug 14 at 18:11 comment added Ian Agol There is a cool way to see the extension special to $H^3$, where the upper half space is identified with the quaternions $\{ z+tj | z\in \mathbb{C}, t >0\}$ and conjugation is given by the usual formula. See Exercise 4.4 #6 of Ratcliffe. P. 118 link.springer.com/book/10.1007/978-3-030-31597-9
Aug 7 at 22:35 answer added Alex Elzenaar timeline score: 3
Aug 7 at 16:51 history became hot network question
S Aug 7 at 15:48 history suggested user479223 CC BY-SA 4.0
C to \mathbb C
Aug 7 at 14:37 review Suggested edits
S Aug 7 at 15:48
Aug 7 at 14:23 history edited YCor CC BY-SA 4.0
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Aug 7 at 14:17 answer added Abdelmalek Abdesselam timeline score: 8
Aug 7 at 14:06 answer added Robert Bryant timeline score: 15
Aug 7 at 13:47 answer added Alexandre Eremenko timeline score: 7
Aug 7 at 9:57 history edited ThiKu
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Aug 7 at 8:49 history asked Ilya Gekhtman CC BY-SA 4.0