7:59 AM
Older question: Proving inequality $(a+\frac{1}{a})^2 + (b+\frac{1}{b})^2 \geq \frac{25}{2}$ for $a+b=1$
Posted today: If $a,b>0$ and $a+b=1\;,$ Then minumum value of $(a+\frac{1}{a})^2+(b+\frac{1}{b})^2$ is
The new question is not tagged proof-verification, but the OP also asks where they went wrong. (But they have already received answer for this and they are probably satisfied with the answer, since they accepted one of the answers.
They are not suitable for merging, since the answers to the newer question specifically address the OP attempt.
Are there any ideas how to improve the older one, so that it is not plain PSQ? (The question seems interesting to me, so I would prefer to keep it on the site.)
juantheron: If the main point of your question is to discuss this particular attempt to prove the inequality, you should probably add the (proof-verification) tag. If you are interested in any proof, then it is duplicate of the older question. (And even if it is proof verification question, if you are already satisfied with the comments you have received on your proof, I think that it can be closed as a duplicate. So that if other users are looking for this inequality and find this question, they are directed to the older one.) — Martin Sleziak 19 secs ago
1 hour later…
9:26 AM
@MartinSleziak I have voted to close as a duplicate of the newest question. (One of the older questions has no answer. The other one has answer which deals with pings in chat, although the question seems to be about comment-replies.) Feel free to let me know if you disagree with the way I voted there.
Both of them are already in the close votes review: meta.math.stackexchange.com/review/close/3535 and meta.math.stackexchange.com/review/close/3536
3 hours later…
12:32 PM
@DanielFischer It seems that the question was protected automatically. (At least it says " Question Protected by Community♦" in the revision history.)
23 hours ago, by Martin Sleziak
The same faq says that: "The system (via the Community user) will automatically protect a question that's had three answers from low-rep users deleted or 5 answers from low-rep users posted in the past 24 hours."
And exactly as you say, the two timestamps (answer deletion/question protection) are exactly the same: math.stackexchange.com/posts/1805657/timeline and math.stackexchange.com/posts/1805312/timeline
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