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
What is a proof?
Mathematical grammar and correct use of terminology Inductive proofs: some common mistakes and misconceptions
Sets and Functions
Difference Between Inverse Functions and Inverse Images
One-to-one and onto: What you are really doing when you solve equations Direct Sums Lists, linear combinations, and linear independence Some notes on bases and dimension
Convex Sets in Vector Spaces
Using elementary operations to compute determinants