Chapter 4 ~ 6 English translation added

• fix typos
• Chapter 4 ~ 6 English translation added

Chapter 1 ~ 3 English translation added

• fix typos
• Chapter 1 ~ 3 English translation added

Chapter 6 done

• fix typos in early chapters
• Chapter 6 done

Chapter 5 done

• fix typos in early chapters
• Chapter 5 done

Chapter 4 done

• fix typos in Chapter 1, 2, 3
• Chapter 4 done

Part I released

The LA-notebook project aims to build a set of linear algebra materials for self-learners.
The plan is to build (at least) two parts, covering the linear algebra course for undergraduate students.
Now the first part is done!