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Mar 15, 2023 at 16:53 vote accept Giuseppe Negro
Mar 10, 2023 at 9:56 history edited B K CC BY-SA 4.0
Added remark that the argument works only for $C^1$-functions.
Mar 9, 2023 at 8:29 history edited B K CC BY-SA 4.0
Removed additional remark, which was not entirely correct.
Mar 7, 2023 at 8:09 history edited B K CC BY-SA 4.0
added 199 characters in body
Mar 6, 2023 at 17:29 comment added B K @GiuseppeNegro: yes.
Mar 6, 2023 at 17:25 comment added Giuseppe Negro "Write the sphere as a union of circles meeting at poles" means that the circles are meridians, I guess. Like in the following image: home.csulb.edu/~rodrigue/geog140/meridian.jpg Is this right?
Mar 5, 2023 at 18:51 history answered B K CC BY-SA 4.0