"Lord Xu, your family sees you.” Tianprison, room 24.In the dark, gloomy cell, a dirty figure was curled up in the corner, now sleeping soundly against a pile of straw. From far and near to the sound of footsteps slowly approaching. The prisoner opened his eyes.His eyes were bloodshot and unwilling. After rebirth to this world, although Xu Xing felt that his first half of his life was mediocre, did not do what earth-shattering events, but thanks to the former world university, higher education, in arithmetic in this aspect of the attainments is quite good. So he created a simpler way to write numbers, and introduced mathematical inventions such as calculus. Two years ago, he was selected as the stable cheng of Taifu Temple after the provincial Ministry of Rites...