Theorem 1 and are equivalent infinitesimals if and only if.

定理1与是等阶无穷小的充分必要条件为.

Reaching infinitesimals , mathematics, the most exact of the sciences, leaves the process of analysis and enters on a new process of approximating to summing up the unknown infinitesimals .

数学这门最精密的科学获得无限小数的时候，便放弃解析的过程，开始总和未知的无限小数的新过程。