For more than ten years, users have been finding out the identity of Cleo, a brilliant female mathematician. It turned out he was an American programmer from Uzbekistan. It was identified by email

At the end of 2013, a new user named Cleo appeared on the Stack Exchange math forum. Later, the profile clarified that she was a woman. For two years, she gave correct answers to complex mathematical questions without explaining the solution, after which she disappeared. During this time, Cleo became something of an urban legend. For more than ten years, forum participants have been trying to understand who is hiding behind this profile. It wasn…