cqfd

@ArcticChar Now it is as clear as day that all three accounts belong to the same person.

@amWhy Thank you. I will keep that in mind for the next time.

FWIW, recently someone named Jenny asked a question from the same textbook:math.stackexchange.com/q/4188210/588038

@amWhy I saw a discussion about sock puppets above, and I feel like this is a similar situation.

Someone keeps asking the same question over and over again: math.stackexchange.com/q/4197358/588038

@MartinSleziak Thank you for your time and kindness. I'm almost sure that it's just the usual process, as you said.

Oh wait, the question has more than 100 views. That reduces the ageing away period to four days. Right?

I tried to cast a vote again and got the message, as you mentioned. It also mentions the exact time of my previous vote: Nov 6 at 9:27.

Yes, that's a possibility, but I don't know anything about SEDE:|

@MartinSleziak It says Nov 6.

@MartinSleziak thanks, I didn't know about the ageing away process. But if you look at, for example, the recent close vote attempt, it mentions Nov 4. I presume that's the day the first vote occured. But it then got invalidated on Nov 12. That's not a 14 day period, right?

I have been observing this question for a while. The timeline is interesting. Can someone tell me the reason for close votes getting invalidated? (If I remember correctly, I once saw a close vote and cast the second vote. I don't know what happened next, but in the end the question was still there with no close votes.)

@XanderHenderson Can you please have a look at my recent flag? Thank you.

*on September 19.

Hi! I raised a flag on September 15. It's still pending...

@MartinSleziak Thanks. I don't know if they violate any rules. Maybe I will flag.

I suspect someone's using two or three accounts to ask questions here. Is it OK to do so?

@quid Thank you! I wasn't aware of the refunding policy.

@ArnaudD. Yep, it shows a monthly reputation of 4 here.

@Knight Are you talking about the earned bounties? Anyway, AFAIK, everything should be reflected on their reputation tab. I don't know, may be a bug.

Here I see a user with 602 reputation gain this month. But there's nothing much on their activity tab. Can someone tell me what's going on?

Request for undeletion. The linked question now has context.

Close (Oops!)

[Close]. Also, see my comment.

Reopen.

@XanderHenderson Thanks for the reply. Yep, there's nothing new about the answer.

I'm new to this Deletion/Undeletion business. Last time, I voted to undelete this post, because, in my opinion, it satisfies the MSE guidelines. Now it again has two delete votes. So am I doing this wrong?

@user21820 Thank you for the information.

Please see this post. Is this kind of post allowed here?

7

Sorry if this doesn't belong here: please have a look at these closely related(same?) posts 1, 2,3

Bye!

Hmm, I don't think that's necessary.

I planned to do my assignment lol

Ok, goodbye!

Hopefully, someone else will answer.

I will delete my answer

nope

I think I have an answer. Let me write.

lemme think

Ok, I see your point

Hmm, ok

Is there anything wrong with my solution? I can't see any

All I did was to apply this.

Let $a,b$ be positive elements. Then $a-b\leq a$, right?

But I never claimed that $b\geq a$.

Did I? I only used that if $a$ and $b$ are positive, then $a-b\leq a$? Oh, ok, I did use.

I don't understand the question. Why do we need that assumption? Are you discarding some other assumption?

I'm not familiar with operators that aren't linear. Sorry $\ddot\frown$

Did you write that correctly? Because there are no counterexamples. (Why?) $\ddot\smile$