Liu is a mathematical genius. Liu, a 39-year-old middle-aged man from rural Tianjin, claimed to have borrowed 3000 yuan to attend the math conference. He claimed that he had proved Goldbach and a series of other "conjectures". According to incomplete understanding, about 100 folk mathematicians from all over the country came to Beijing during the International Congress of Mathematicians. Some of them have obtained the qualification to attend the conference through normal registration procedures, while others can only use various opportunities to get in touch with the mathematicians attending the conference.