The Fields Medal winners Caucher Birkar of Iran, Alessio Figalli of Italy, Peter Scholze of Germany and Akshay Venkatesh of India (L to R) are pictured during the opening ceremony of the 2018 International Congress of Mathematicians in Rio de Janeiro, Brazil, on Aug. 1, 2018. Mathematicians from Germany, India, Iran and Italy were awarded the prestigious Fields Medal during the International Congress of Mathematicians held in Rio de Janeiro on Wednesday. (Xinhua/Li Ming)