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Jun 9, 2023 at 12:53 vote accept user505117
Jun 9, 2023 at 10:51 history edited Francesco Polizzi
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Jun 9, 2023 at 8:24 comment added Francesco Polizzi I added a proof of $(1)$ as an answer.
Jun 9, 2023 at 8:23 answer added Francesco Polizzi timeline score: 6
Jun 8, 2023 at 19:20 comment added user505117 @FrancescoPolizzi I don't know. Can you give me a hint how to apply the Ehresmann Lemma to get the answer to my question 1?
Jun 8, 2023 at 18:03 comment added Francesco Polizzi Is it not a consequence of Ehresmann Lemma?
Jun 8, 2023 at 13:07 history asked user505117 CC BY-SA 4.0