Final answer:
Qin mathematics is sparsely documented due to a lack of historical records and a focus on practical governance by the Qin Dynasty.
Step-by-step explanation:
The reason why so little is known about Qin mathematics is primarily due to a lack of historical records. Qin was an ancient Chinese dynasty that existed from 221 to 206 BC, and many of its written documents and records did not survive over time. Additionally, the Qin Dynasty suffered from political instability and conflicts, which could have further contributed to the loss of mathematical knowledge.
It is important to note that the Qin Dynasty did not use mathematics extensively, as their focus was more on practical governance and centralized control. The dynasty's emphasis on violent power and surveillance may have overshadowed the development and documentation of mathematical concepts.