Index

Differential Equations

The content is from MIT 18.03 SC

I did the following changes: * Added some proofs, such as Convolution Associativity in 2702, the original text is "xxx...yyy...zz. (left as an exercise)", and I wrote the proof; Exercise in 0304. * For some proofs and exercises, I added some steps to make it easier for me to understand(3610); * Fixed some typos, for instance, 3506 1.ii; maybe I introduced some new typos

A Walk Through Combinatorics

内容来自A Walk Through Combinatorics - An Introduction to Enumeration and Graph Theory Fourth Edition，该书是MIT 18.314的指定参考书。
我基本意译了整本书的正文内容，且 * 补充了一些留给读者的证明或者思考 * 对于一些作者认为显然而我花了些时间看明白的地方做了补充 * 对于部分个人不太懂得地方（证明、习题等），在Mathematics Stack Exchange求助并做补充