Preface to the Special Topic on Computer Mathematics

This special topic on Computer Mathematics of Journal of Systems Science ＆ Complexity is the collection of 8 excellent papers presented at the 12th Congress of Computer Mathematics of Chinese Mathematical Society held in Guilin, China during June 4–7, 2021. To look back its successful convening now, this conference was truly a blessed one at the right timing, at the right place, and with the right people in the up-and-downs of COVID-19 epidemic.