This question has 4 votes to close.
I have no idea why it was voted to close so heavily.
I need to know the reason because otherwise I cannot improve the question to avoid closure.
So I posted a meta question which asks for the reason for voting to close it. It seemed to be deleted immediately. Posting a meta question which asks for the reason for voting to close a specific question is not allowed here?
Nov 5, 2013 Since there seem to be some misunderstandings, I will state my case more clearly. I read all of the members' opinions in this meta thread. I edited the question to comply with them as follows.
I added a statement that says I already had a solution of the problem.
I added the motivation
I put my solution in a spoiler box.
I added the alternative-proof tag.
However, it still has 4 close votes. I have no idea why. That's why I posted the meta question which a moderator deleted.
Nov 6, 2013 I would like to point out the following policy of StackExchange because it doesn't seem to be well-known and it is relevant to the present case.
It’s also perfectly fine to ask and answer your own question, as long as you pretend you’re on Jeopardy! — phrase it in the form of a question. So … if you have a question that you already know the answer to if you’d like to document it in public so others (including yourself) can find it later it is OK to ask, and answer, your own question on a relevant Stack Exchange site. To be crystal clear, it is not merely OK to ask and answer your own question, it is explicitly encouraged.