Matteo Ricci dengan Xu Guangqi (kanan)
Matteo Ricci (left) and Xu Guangqi (right) in the Chinese edition of Euclid's Elements , published in 1607.
Matteo Ricci (kiri) dan Xu Guangqi (徐光启) (kanan) dalam Unsur Euclid edisi Cina(《几何原本》)