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Sep 2, 2020 at 1:50 comment added LWW GH from MO // The proof in the Borel's book is wrong. I resolved the questions, using different approach. Anyway, thank you for the comment.
Aug 29, 2020 at 21:37 comment added GH from MO Please restrict to one question per post (standard MO policy). Your first question concerns Lemma 5.15 in Borel's book. The proof is included in the book, right below the lemma (it takes about one page).
Aug 29, 2020 at 8:54 history asked LWW CC BY-SA 4.0