Preface to the Special Issue “Celebrating the 80th Birthday of Professor Chaohui Ye”

It’s hard to imagine the unlimitedness of human life until you see it with your own eyes. Professor Chaohui Ye demonstrates to us how unlimited and meaningful a life can be, by maximizing his talents and efforts in every position. He is such a gentleman, a great scientist, an encouraging supervisor, an insightful research group leader and a profound thinker, who inspired and influenced so many, including the authors and guest editors of this special issue.