Which options describe Chinese developments in mathematics?
(Select all that apply.)
A:The Han Dynasty invented calculus, even though Sir Isaac Newton has been given credit in most history books.
B:The Chinese discovered the ratio of a circle’s circumference to its diameter, known as pi (π), centuries before the Greek Empire.
C:The first Chinese book about mathematics, Nine Chapters on the Mathematical Art, was composed before 200 BC.
D:Prior to inventing numbers, the Chinese method of number writing used clusters of short vertical or horizontal lines for digits.
Is it C & D?