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Jan 1, 2019 at 19:59 comment added Ester Mariucci That's a wonderful and clever proof, many thanks! I'm marking this as accepted (although @egs's one also proves the desired inequality) also because it came first.
Jan 1, 2019 at 19:54 vote accept Ester Mariucci
Jan 1, 2019 at 19:54 vote accept Ester Mariucci
Jan 1, 2019 at 19:54
Dec 31, 2018 at 4:10 history answered fedja CC BY-SA 4.0