For example, b =1/x 2 and a =1/x. x-& gt； Infinite time, in layman's terms, time b tends to 0 faster than a, so it is called B higher order. If c = 1/x 10, then c is higher than a b, because c tends to 0 faster.
If LIMB/A n = constant, it is said that B is an n-order infinitesimal of A, and B and A n are infinitesimals of the same order.
The order of determinant has nothing to do with the order of infinitesimal, and it is called "order" in the description, but its definition is different.
Online substitute classes, some talk about determinant first, and some talk about matrix first. In fact, the relationship between the two is not very big, and there is no need to worry about its disorder in learning. For determinant, as long as we know the operation rules of the third-order determinant, it is almost enough to deal with problems such as high numbers and matrices. Determinants in line generation are mainly about simplification.