This week we did more proofs. It is very challenging but
interesting. However, I did have hard time understanding the proof of prime
number, because there are many underlying math knowledge.
If I came across this problem for the first time, I could think of using proof by contradiction. The general structure and first few steps were easy to come up. However, I would definitely get stuck on the fourth line of the proof. I had to know that prime number starts from 2. I felt this comment was not understandable, because I did not know why we could use this fact without proving it. There were more lines that I was confused with. The comment in the line 6 was not a fact that I could come up by myself.
The question that bothered me was that I did not know what math knowledge that we could use for granted, because I felt like other than some basic algebra knowledge, I had to prove anything in 165.
I still work on this proof and want to find a another to prove it without using those facts.
