Whispering Jianghu
Just a little thing about the 9x9 ... but in fact the decimal systéme as be created by the Egyptian 2000 years before the Chinese (III century before JC for egyptian, -1'500 or -1'200 for the Chinese). And for the calculus table, it the Greek, and not the Chinese who mad it. So yeah, whe see again a bulsh*t chinese author who brag abouth "how great ancien chinese are" in spouting nonsense. Again ... They are realy the better of all to rewrite history, seriously ...
Well these people who are commenting have no idea what they are talking abou? Look at gunpowder? Look at paper? Look at abacus? Who invented it? Do you know when the great wall was built? Do you know what it takes to build such gigantic monument 2300 years ago?. you know what is abacus right?. so saying mathematics of ancient china was ahead is nothing racist or nationalistic it is just hard cold fact as much as western powers would like to deny. Chinese civilization was way advanced for its age during european middle ages so let them have their old glory what is wrong with you people? I will tell you again look at shang dynasty zhou dynasty Qin dynasty they were way ahead of any european power in every field be it population or be it technology throughout history until 14th century. European history is not any less glorious or is much more glorious but only after 14th century before that china was leading the world.