Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture Money Videos
Cheng Dawei
Directory
References
Discover
cloning. First cloned cat. First cloned companion animal. CC (copy cat) female domestic shorthair cat (b. Dec. 22, 2001) photo Jan. 18, 2002. Cloned at Texas A&M Univ. College of Vet. Med. & Biomedical Sciences. Reproductive cloning genetics DNA cc cat
CC, The First Cloned Cat
Statue of Nostradamus
Nostradamus and His Prophecies
The Cheshire Cat is a fictional cat from Lewis Carroll's Alice's Adventures in Wonderland. (Alice in Wonderland)
11 Banned Books Through Time
Snowshoe hare (Lepus americanus) with its Summer coat on the left side and its winter coat on the right.
7 Animals That Turn White in Winter
American bison (Bison bison) also known as buffalo or plains buffalo on the prairie, western U.S.
What’s the Difference Between Bison and Buffalo?
Andrew Jackson delivering a speech while on his way to Washington, D.C., for his inauguration in 1829. From Harper's Weekly, 1881.
5 Remarkably Close U.S. Presidential Elections
United States electoral college map showing number of electoral votes by state.
How Does the Electoral College Work?

Cheng Dawei

Chinese mathematician

Learn about this topic in these articles:

study of abacus

  • Counting boards and markers, or counting rods, were used in China to solve systems of linear equations. This is an example from the 1st century ce.
    In East Asian mathematics: Fall into oblivion, 14th–16th centuries

    … (“Systematic Treatise on Mathematics”) by Cheng Dawei (1592), had a special significance. In addition to its detailed treatment of arithmetic on the abacus, it provided a summa of mathematical knowledge assembled by the author after 20 years of bibliographic research. Re-edited several times through the 19th century, the “Systematic Treatise”…

    Read More