In honor of Zhang's achievements in science and technological innovation, his friend Cui Ziyu (Cui Yuan) wrote a memorial inscription on his burial stele, that has been preserved in the Guwen yuan.[eight] Cui mentioned, "[Zhang Heng's] mathematical computations exhausted (the riddles of) the heavens and the earth. His innovations were https://wm5587520.luwebs.com/32282637/examine-this-report-on-heng365