After a year of systematic study of mathematics, I have a little experience. The record is as follows. Even if the future knowledge is violent, the boat will have a small but firm direction.
写在前面的话
版本：2019-07-23 @阆苑祁寒 全文不得转载
经过一年对数学的系统学习，略有心得，今记录如下，纵使未来的知识的汪洋狂风暴雨，一叶扁舟也好有一个渺小但坚定的前进方向。
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