尝试对《什么是数学》中的练习题给出解法；Try to offer solustions of WHAT IS MATHEMATICS
《什么是数学》（What is Mathematics?)是我很喜欢的一本书。不过，也许是因为自己愚钝，一直没能成功读完整本书，遑论做完书中的题目了。坦白说，解题并不是一件非常困难的事情，特别是当你掌握的数学工具越来越多的时候，然而仅使用书中的体系（大抵是高中的数学工具）许多题目我都觉得很有难度。
本仓库，就是我尝试的解题方法。
This repository is my solutions to the book WHAT IS MATHEMATICS written by Richard Courant and Herbert Robbins. And I hope this would be helpful for readers of the book, especially students interested in mathematics.
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