I don't get why my question here: Summation identity involving the floor function
is locked even though the due date for the contest was done last 10th December, 2014?
After clearing the rest of the flag queue I had the time to take another look. Your claim was easy to verify (thanks to Brian M. Scott for giving the link). Unlocking. Sorry about this.
My first response below. Leaving it there in case somebody wants to criticize me further and is running out of ammo.
I was the moderator who locked the question in response to it being flagged.
I have been personally involved with math contests for a long time. In my youth as a competitor, and later as a referee and an organizer. Therefore I will enforce our policy on contest questions with possibly too much zeal. Anyway, my approach here is to lock first and investigate later.
The previous question you had posted was from an ongoing contest, well publicized in Meta.