(From left) Professor Yang Ren, Head of Department of Physics; Professor Étienne Ghys; Professor Phillippe Ciarlet, HKIAS Senior Fellow; Professor Ya Yan Lu, Head of Department of Mathematics; Ms Camélia Aissat, Deputy Consul of Education and Culture, Consulate General of France in Hong Kong & Macau; Professor Neil Chada, Assistant Professor of Department of Mathematics; and Mrs Martine Ghys