For mathematical genius Wan Daqing, life is no longer a competition between China and the United States. Instead, he has encountered the rivalry of universities from different provinces seeking to appoint him.Wan, winner of China’s highest mathematics prize, retired from the University of California at Irvine (UCI) in July and returned to China to take up his new role in December, he confirmed in an email to the South China Morning Post.The International Congress of Chinese Mathematicians...