_ _ _ _ I have only heard of: elementary mathematics, advanced mathematics (referred to as advanced mathematics); Primary school to middle school (middle school includes junior high school and senior high school) studies elementary mathematics, and universities study advanced mathematics (also divided into general mathematics and professional mathematics).

_ _ _ _ low mathematics, and this disrespect for mathematics? Is there a difference between high and low mathematics? What child asks his mother when he is born: What is a partial differential equation? Just like a big tree demeaning its roots, ridiculous!