Typos listed in https://github.com/mateus-amarante/master_thesis/issues/1#issuecomment-757786766 by @lienguang0624 * Eq. (3.51) <img src="https://user-images.githubusercontent.com/7409263/104433569-02b0cb80-5569-11eb-8ff1-7711b5f3bd4a.png" height=20> * Eq. (3.56) <img src="https://user-images.githubusercontent.com/7409263/104434603-2c1e2700-556a-11eb-9117-50bb99fc90d2.png" height=20>
