前文从群开始讨论了抽象代数的一些基本概念，这篇文章我们完成讨论到有限域的构造。

为了后面要讨论的Finite Projective Plane的构造算法中用到的Finite Prime Field，我们需要做一些抽象代数的回归。完整的抽象代数教材和课程固然好，但不适合突击。我找到了一份不错的小件一点儿的资料Introduction to finite fields (是Stanford CS250/EE387的补充阅读)。基于这份资料，我们列出所有需要弄清楚的问题，然后一一整理明白。

Continuing with previous notes of Abstract Algebra, here we come to the concept of Rings. This time we use the textbook of Tom Judson’s Abstract Algebra: Theory and Applications.

Recently I spend some time on doing the homework of UCB math113, here is group part.