You can see these notes as a testament to the universal power of math---someone knowledgeable in advanced math could easily understand this handout... Learn your math people: it's like superpowers!
To use an investment analogy, any investment you do in learning math is guaranteed to succeed: it will never depreciate in value, and "owning math stock" will get you invited to some good clubs.
Highly recommend anyone interested in higher maths to take this class.
Aside from that, it's a requirement to take descrete mathematics before going onto Linear Alegbra at most universities.
edit: the book in the link looks just as good.
Had to take a mostly equivalent class (Intro. to Abstract Math) for my Math degree as well, and the professor explained the same concepts clearer and everyone seemed to come out with a good understanding.
1. This is an awful thing to say.
2. The grandparent is probably referring to Rosen's Discrete Mathematics and Its Applications (http://highered.mcgraw-hill.com/sites/0073383090), not his number-theory book.
That is true, but JoshGlazebrook didn't say "Rosen's book is terrible", but rather "Will give this a read through to see if it explains better than Rosen". It is certainly a fair thing for him to struggle personally with the explanations in a textbook, no matter how good it is; and turning this constructive comment into occasion for a personal attack / judgement is, I think, unnecessary and unconstructive. By contrast, chris_wot's comment downthread (https://news.ycombinator.com/item?id=7247572), asking what is unsatisfactory, seems far more likely to generate productive discourse.
(For what it's worth, I am using Rosen this semester, and find it roughly middle of the road; I like it, but can understand that it might not be for everyone.)
2. Not everyone understands discrete math
I would say it is a good reference guide but definitely needs to be used in conjunction with other texts.