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    $\begingroup$ Welcome to MathOverflow. $\endgroup$ Commented Aug 26, 2022 at 17:14
  • $\begingroup$ I'd like to add my welcome to that of Andreas. Thank you, that is very interesting! I guess the document may have ended up as the appendix Univers in SGA? But back to the original question, which wasn't as explicit as it should have been: what is the definition of a galaxy? I tried asking my library to arrange to somehow borrow or get an electronic copy of your thesis, but it seems I have to talk to Paris instead. My quest is not yet over... $\endgroup$ Commented Aug 27, 2022 at 1:25