Book of Proof, by Richard Hammack. This is one of the textbooks currently being used in MHF3202 Sets and Logic.
Taking and Using Notes in a College Math Class
Sets and Functions
What is a proof?
Mathematical grammar and correct use of terminology Inductive proofs: some common mistakes and misconceptions
One-to-one and onto: What you are really doing when you solve equations Direct Sums
Convex Sets in Vector Spaces Lists and linear independence