Ethnomathematics! Doesn’t the very term conjure up visions of politically correct wallahs (and walis) trying to prove, in a postmodern way, that “all cultures are equal”?
True, previous generations of math historians had tended to be unjustifiably Eurocentric, though the really great ones, like the Swiss-American
Florian Cajori (1859 - 1930) were certainly not so. But to me there are two great benefits to be gained from the study of the maths of the East.
Firstly, the achievements of China, India and the Middle East give the lie to any postmodern assertion (if that’s not an oxymoron) that mathematics is a culture-dependent thing without any fundamental underlying reality.