CS61A spring 2023 website:https://inst.eecs.berkeley.edu/~cs61a/sp23/

vedio:https://www.youtube.com/watch?v=0P4kOL7pFFo&list=PL6BsET-8jgYWZlcJMOuWFSXKc99cSneEN&ab_channel=JohnDeNero

textbook:https://www.composingprograms.com/

translated:https://composingprograms.netlify.app/

#unfinished:lab12 13 hw 10 proj 4

When $a \ne 0$, there are two solutions to $(ax^2 + bx + c = 0)$ and they are $$ x = {-b \pm \sqrt{b^2-4ac} \over 2a} $$

The Cauchy-Schwarz Inequality

$$\left( \sum_{k=1}^n a_k b_k \right)^2 \leq \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)$$