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Jun 12, 2021 at 16:28 history edited Anthony Quas CC BY-SA 4.0
added 5 characters in body
Jun 12, 2021 at 14:12 comment added Anthony Quas It's definitely not sharp: for that you would need the extremal example for one inequality to be extremal for the other also. I don't know a name for this kind of inequality.
Jun 12, 2021 at 13:14 comment added user44143 Thanks! Is there an example to show that this $1/18$ is sharp? And is there a name for inequalities like this?
Jun 12, 2021 at 13:13 history edited user44143 CC BY-SA 4.0
clarified how to use the lemma, fixed a subscripting issue
Jun 12, 2021 at 5:43 history answered Anthony Quas CC BY-SA 4.0