Yusuf al-Mutamin,was a mathematician. He wrote Kitab al-Istikmal (Book of Perfection) in mathematics.
Born on 1371 Died on 1433
Zheng He (1371-1433), or Cheng Ho, is arguably China's most famous navigator. Starting from the beginning of the 15th Century, he traveled to the West seven times. For 28 years, he traveled more than 50,000 km and visited over 37 countries. Zheng He died in the tenth year of the reign of the Ming em...