Issue certificates by post. According to the inquiry, Zhihu shows that the digital cup tournament is in Chinese, and all the information appearing on the page is filled in Chinese. Because it involves cross-school issues, the school name and certificate of each team member are mailed. The National Mathematical Modeling Competition of Digital Dimension Cup for College Students is a national mathematical modeling activity jointly sponsored by the Organizing Committee of Digital Dimension Cup Mathematical Modeling Competition, Inner Mongolia Innovation Education Society and Inner Mongolia Innovation Education Resources Development Research Institute.